[INFO] cloning repository https://github.com/Chaitanya-exe/DSA_practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Chaitanya-exe/DSA_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChaitanya-exe%2FDSA_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChaitanya-exe%2FDSA_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f0380e40c2ae2cad0b978cf4970b01b7127e8e5b
[INFO] linting Chaitanya-exe/DSA_practice against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChaitanya-exe%2FDSA_practice" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Chaitanya-exe/DSA_practice
[INFO] finished tweaking git repo https://github.com/Chaitanya-exe/DSA_practice
[INFO] tweaked toml for git repo https://github.com/Chaitanya-exe/DSA_practice written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Chaitanya-exe/DSA_practice on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Chaitanya-exe/DSA_practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b77bec007f03c98c0aeb8142d452d73b2202428cad090b8582835f971208747
[INFO] running `Command { std: "docker" "start" "-a" "3b77bec007f03c98c0aeb8142d452d73b2202428cad090b8582835f971208747", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b77bec007f03c98c0aeb8142d452d73b2202428cad090b8582835f971208747", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b77bec007f03c98c0aeb8142d452d73b2202428cad090b8582835f971208747", kill_on_drop: false }`
[INFO] [stdout] 3b77bec007f03c98c0aeb8142d452d73b2202428cad090b8582835f971208747
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f1ab6756285c2207ffde7cc7a6d674ba4b91bf158cbaeed2c47fae352492ca09
[INFO] running `Command { std: "docker" "start" "-a" "f1ab6756285c2207ffde7cc7a6d674ba4b91bf158cbaeed2c47fae352492ca09", kill_on_drop: false }`
[INFO] [stderr]     Checking dsa v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/main.rs:1480:9
[INFO] [stdout]      |
[INFO] [stdout] 1480 |     let mut output: Vec<String> = vec![];
[INFO] [stdout]      |         ----^^^^^^
[INFO] [stdout]      |         |
[INFO] [stdout]      |         help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]     --> src/main.rs:1457:19
[INFO] [stdout]      |
[INFO] [stdout] 1457 | pub fn find_words(board: Vec<Vec<char>>, words: Vec<String>) -> Vec<String> {
[INFO] [stdout]      |                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output`
[INFO] [stdout]     --> src/main.rs:1491:9
[INFO] [stdout]      |
[INFO] [stdout] 1491 |         output: Vec<String>,
[INFO] [stdout]      |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_output`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/main.rs:1827:9
[INFO] [stdout]      |
[INFO] [stdout] 1827 |     let mut length = 2;
[INFO] [stdout]      |         ----^^^^^^
[INFO] [stdout]      |         |
[INFO] [stdout]      |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]     --> src/main.rs:1823:50
[INFO] [stdout]      |
[INFO] [stdout] 1823 | pub fn max_value_after_partition(nums: Vec<i32>, k: i32) -> i32 {
[INFO] [stdout]      |                                                  ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]     --> src/main.rs:1827:9
[INFO] [stdout]      |
[INFO] [stdout] 1827 |     let mut length = 2;
[INFO] [stdout]      |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prev2` is never read
[INFO] [stdout]     --> src/main.rs:1846:21
[INFO] [stdout]      |
[INFO] [stdout] 1846 |     let mut prev2 = 0;
[INFO] [stdout]      |                     ^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout]      = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `traverse_board` is never used
[INFO] [stdout]     --> src/main.rs:1486:8
[INFO] [stdout]      |
[INFO] [stdout] 1486 |     fn traverse_board(
[INFO] [stdout]      |        ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: importing legacy numeric constants
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::i32;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: remove this import
[INFO] [stdout]   = note: then `i32::<CONST>` will resolve to the respective associated constant
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
[INFO] [stdout]   = note: `#[warn(clippy::legacy_numeric_constants)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]   --> src/main.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 |     low as i32
[INFO] [stdout]    |     ^^^^^^^^^^ help: try: `low`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/main.rs:82:5
[INFO] [stdout]    |
[INFO] [stdout] 82 |     return students;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 82 -     return students;
[INFO] [stdout] 82 +     students
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     result as i32
[INFO] [stdout]     |     ^^^^^^^^^^^^^ help: try: `result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: returning the result of a `let` binding from a block
[INFO] [stdout]    --> src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let count = upper_bound - lower_bound;
[INFO] [stdout]     |     -------------------------------------- unnecessary `let` binding
[INFO] [stdout] 141 |
[INFO] [stdout] 142 |     count
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stdout]     = note: `#[warn(clippy::let_and_return)]` on by default
[INFO] [stdout] help: return the expression directly
[INFO] [stdout]     |
[INFO] [stdout] 140 ~     
[INFO] [stdout] 141 |
[INFO] [stdout] 142 ~     upper_bound - lower_bound
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:107:26
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn lower_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout]     |                          ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]     = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 107 -     fn lower_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout] 107 +     fn lower_bound(nums: &[i32], target: i32) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:122:26
[INFO] [stdout]     |
[INFO] [stdout] 122 |     fn upper_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout]     |                          ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 122 -     fn upper_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout] 122 +     fn upper_bound(nums: &[i32], target: i32) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:216:5
[INFO] [stdout]     |
[INFO] [stdout] 216 |     return length as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 216 -     return length as i32;
[INFO] [stdout] 216 +     length as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `chars`
[INFO] [stdout]    --> src/main.rs:202:14
[INFO] [stdout]     |
[INFO] [stdout] 202 |     for i in 0..chars.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout]     = note: `#[warn(clippy::needless_range_loop)]` on by default
[INFO] [stdout] help: consider using an iterator and enumerate()
[INFO] [stdout]     |
[INFO] [stdout] 202 -     for i in 0..chars.len() {
[INFO] [stdout] 202 +     for (i, <item>) in chars.iter().enumerate() {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     return length as i32;
[INFO] [stdout]     |            ^^^^^^^^^^^^^ help: try: `length`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 |     return min_energy as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 241 -     return min_energy as i32;
[INFO] [stdout] 241 +     min_energy as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:241:12
[INFO] [stdout]     |
[INFO] [stdout] 241 |     return min_energy as i32;
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^ help: try: `min_energy`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 |     return max_len as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 275 -     return max_len as i32;
[INFO] [stdout] 275 +     max_len as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:354:5
[INFO] [stdout]     |
[INFO] [stdout] 354 |     return (max_char, max_freq);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 354 -     return (max_char, max_freq);
[INFO] [stdout] 354 +     (max_char, max_freq)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     if freq1 == freq2 { true } else { false }
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `freq1 == freq2`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout]     = note: `#[warn(clippy::needless_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]    --> src/main.rs:399:14
[INFO] [stdout]     |
[INFO] [stdout] 399 |     for i in 0..nums.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]     |
[INFO] [stdout] 399 -     for i in 0..nums.len() {
[INFO] [stdout] 399 +     for <item> in &nums {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:409:5
[INFO] [stdout]     |
[INFO] [stdout] 409 |     count as i32
[INFO] [stdout]     |     ^^^^^^^^^^^^ help: try: `count`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:431:5
[INFO] [stdout]     |
[INFO] [stdout] 431 |     return max_len as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 431 -     return max_len as i32;
[INFO] [stdout] 431 +     max_len as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]    --> src/main.rs:463:14
[INFO] [stdout]     |
[INFO] [stdout] 463 |     for i in 0..nums.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]     |
[INFO] [stdout] 463 -     for i in 0..nums.len() {
[INFO] [stdout] 463 +     for <item> in &nums {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:509:5
[INFO] [stdout]     |
[INFO] [stdout] 509 |     return false;
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 509 -     return false;
[INFO] [stdout] 509 +     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `if let` to pattern match a bool
[INFO] [stdout]    --> src/main.rs:502:12
[INFO] [stdout]     |
[INFO] [stdout] 502 |         if let true = frequency.contains(&num) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the condition directly: `frequency.contains(&num)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stdout]     = note: `#[warn(clippy::redundant_pattern_matching)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:554:9
[INFO] [stdout]     |
[INFO] [stdout] 554 |         return true;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 554 -         return true;
[INFO] [stdout] 554 +         true
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:556:9
[INFO] [stdout]     |
[INFO] [stdout] 556 |         return false;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 556 -         return false;
[INFO] [stdout] 556 +         false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:553:5
[INFO] [stdout]     |
[INFO] [stdout] 553 | /     if s_freq == t_freq {
[INFO] [stdout] 554 | |         return true;
[INFO] [stdout] 555 | |     } else {
[INFO] [stdout] 556 | |         return false;
[INFO] [stdout] 557 | |     }
[INFO] [stdout]     | |_____^ help: you can reduce it to: `return s_freq == t_freq`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:645:19
[INFO] [stdout]     |
[INFO] [stdout] 645 | fn add_edge(tree: &mut Vec<Vec<i32>>, u: i32, v: i32) {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 645 - fn add_edge(tree: &mut Vec<Vec<i32>>, u: i32, v: i32) {
[INFO] [stdout] 645 + fn add_edge(tree: &mut [Vec<i32>], u: i32, v: i32) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:676:21
[INFO] [stdout]     |
[INFO] [stdout] 676 |                     return false;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 676 -                     return false;
[INFO] [stdout] 676 +                     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: match expression looks like `matches!` macro
[INFO] [stdout]    --> src/main.rs:681:21
[INFO] [stdout]     |
[INFO] [stdout] 681 | /                     match (check_left, check_right) {
[INFO] [stdout] 682 | |                         (true, true) => true,
[INFO] [stdout] 683 | |                         _ => false,
[INFO] [stdout] 684 | |                     }
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_like_matches_macro
[INFO] [stdout]     = note: `#[warn(clippy::match_like_matches_macro)]` on by default
[INFO] [stdout] help: use `matches!` directly
[INFO] [stdout]     |
[INFO] [stdout] 681 -                     match (check_left, check_right) {
[INFO] [stdout] 682 -                         (true, true) => true,
[INFO] [stdout] 683 -                         _ => false,
[INFO] [stdout] 684 -                     }
[INFO] [stdout] 681 +                     matches!((check_left, check_right), (true, true))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:749:17
[INFO] [stdout]     |
[INFO] [stdout] 749 |                 return check_balance(&n.left) && check_balance(&n.right);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 749 -                 return check_balance(&n.left) && check_balance(&n.right);
[INFO] [stdout] 749 +                 check_balance(&n.left) && check_balance(&n.right)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:754:5
[INFO] [stdout]     |
[INFO] [stdout] 754 |     if check_balance(&root) { true } else { false }
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `check_balance(&root)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/main.rs:799:18
[INFO] [stdout]     |
[INFO] [stdout] 799 |         prefix = String::from(test);
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `test`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]     = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: equality checks against true are unnecessary
[INFO] [stdout]    --> src/main.rs:881:16
[INFO] [stdout]     |
[INFO] [stdout] 881 |             if left_to_right == true {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^ help: try: `left_to_right`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stdout]     = note: `#[warn(clippy::bool_comparison)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:950:21
[INFO] [stdout]     |
[INFO] [stdout] 950 | /                     if compare_subtree(&n1.left, &n2.left) && compare_subtree(&n1.right, &n2.right)
[INFO] [stdout] 951 | |                     {
[INFO] [stdout] 952 | |                         true
[INFO] [stdout] 953 | |                     } else {
[INFO] [stdout] 954 | |                         false
[INFO] [stdout] 955 | |                     }
[INFO] [stdout]     | |_____________________^ help: you can reduce it to: `compare_subtree(&n1.left, &n2.left) && compare_subtree(&n1.right, &n2.right)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]    --> src/main.rs:981:17
[INFO] [stdout]     |
[INFO] [stdout] 981 | /                 if node.val == sub_root_value {
[INFO] [stdout] 982 | |                     if compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout] 983 | |                         res = true;
[INFO] [stdout] 984 | |                         break;
[INFO] [stdout] 985 | |                     }
[INFO] [stdout] 986 | |                 }
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout]     = note: `#[warn(clippy::collapsible_if)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]     |
[INFO] [stdout] 981 ~                 if node.val == sub_root_value
[INFO] [stdout] 982 ~                     && compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout] 983 |                         res = true;
[INFO] [stdout] 984 |                         break;
[INFO] [stdout] 985 ~                     }
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/main.rs:982:64
[INFO] [stdout]     |
[INFO] [stdout] 982 |                     if compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout]     |                                                                ^^^^^^^^^ help: change this to: `sub_root`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]     = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]     --> src/main.rs:1006:9
[INFO] [stdout]      |
[INFO] [stdout] 1006 | /         match node {
[INFO] [stdout] 1007 | |             Some(ref_cell) => {
[INFO] [stdout] 1008 | |                 let n = ref_cell.borrow();
[INFO] [stdout] 1009 | |                 max_el = if n.val > max_el {
[INFO] [stdout] ...    |
[INFO] [stdout] 1019 | |             None => {}
[INFO] [stdout] 1020 | |         }
[INFO] [stdout]      | |_________^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]      = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]      |
[INFO] [stdout] 1006 ~         if let Some(ref_cell) = node {
[INFO] [stdout] 1007 +             let n = ref_cell.borrow();
[INFO] [stdout] 1008 +             max_el = if n.val > max_el {
[INFO] [stdout] 1009 +                 *results += 1;
[INFO] [stdout] 1010 +                 n.val
[INFO] [stdout] 1011 +             } else {
[INFO] [stdout] 1012 +                 max_el
[INFO] [stdout] 1013 +             };
[INFO] [stdout] 1014 +             println!("{}", max_el);
[INFO] [stdout] 1015 +             count_nodes(&n.left, results, max_el);
[INFO] [stdout] 1016 +             count_nodes(&n.right, results, max_el);
[INFO] [stdout] 1017 +         }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `clone` on type `i32` which implements the `Copy` trait
[INFO] [stdout]     --> src/main.rs:1058:27
[INFO] [stdout]      |
[INFO] [stdout] 1058 |                 let val = n.val.clone();
[INFO] [stdout]      |                           ^^^^^^^^^^^^^ help: try removing the `clone` call: `n.val`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stdout]      = note: `#[warn(clippy::clone_on_copy)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `Codec`
[INFO] [stdout]     --> src/main.rs:1076:5
[INFO] [stdout]      |
[INFO] [stdout] 1076 | /     pub fn new() -> Self {
[INFO] [stdout] 1077 | |         Codec
[INFO] [stdout] 1078 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout]      = note: `#[warn(clippy::new_without_default)]` on by default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1075 + impl Default for Codec {
[INFO] [stdout] 1076 +     fn default() -> Self {
[INFO] [stdout] 1077 +         Self::new()
[INFO] [stdout] 1078 +     }
[INFO] [stdout] 1079 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `clone` on type `i32` which implements the `Copy` trait
[INFO] [stdout]     --> src/main.rs:1090:31
[INFO] [stdout]      |
[INFO] [stdout] 1090 |                     let val = n.val.clone();
[INFO] [stdout]      |                               ^^^^^^^^^^^^^ help: try removing the `clone` call: `n.val`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1197:17
[INFO] [stdout]      |
[INFO] [stdout] 1197 |                 return validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max);
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1197 -                 return validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max);
[INFO] [stdout] 1197 +                 validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max)
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `map_or` can be simplified
[INFO] [stdout]     --> src/main.rs:1190:20
[INFO] [stdout]      |
[INFO] [stdout] 1190 |                 if min.map_or(false, |m| val <= m) {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
[INFO] [stdout]      = note: `#[warn(clippy::unnecessary_map_or)]` on by default
[INFO] [stdout] help: use `is_some_and` instead
[INFO] [stdout]      |
[INFO] [stdout] 1190 -                 if min.map_or(false, |m| val <= m) {
[INFO] [stdout] 1190 +                 if min.is_some_and(|m| val <= m) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `map_or` can be simplified
[INFO] [stdout]     --> src/main.rs:1193:20
[INFO] [stdout]      |
[INFO] [stdout] 1193 |                 if max.map_or(false, |m| val >= m) {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
[INFO] [stdout] help: use `is_some_and` instead
[INFO] [stdout]      |
[INFO] [stdout] 1193 -                 if max.map_or(false, |m| val >= m) {
[INFO] [stdout] 1193 +                 if max.is_some_and(|m| val >= m) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1243:9
[INFO] [stdout]      |
[INFO] [stdout] 1243 |         return -1;
[INFO] [stdout]      |         ^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1243 -         return -1;
[INFO] [stdout] 1243 +         -1
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1245:9
[INFO] [stdout]      |
[INFO] [stdout] 1245 |         return *order.iter().max().unwrap();
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1245 -         return *order.iter().max().unwrap();
[INFO] [stdout] 1245 +         *order.iter().max().unwrap()
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]     --> src/main.rs:1288:20
[INFO] [stdout]      |
[INFO] [stdout] 1288 |                 if !node.left.is_none() {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^ help: try: `node.left.is_some()`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]      = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]     --> src/main.rs:1292:20
[INFO] [stdout]      |
[INFO] [stdout] 1292 |                 if !node.right.is_none() {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^ help: try: `node.right.is_some()`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1305:5
[INFO] [stdout]      |
[INFO] [stdout] 1305 |     answer_level as i32
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^ help: try: `answer_level`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `Trie`
[INFO] [stdout]     --> src/main.rs:1314:5
[INFO] [stdout]      |
[INFO] [stdout] 1314 | /     pub fn new() -> Self {
[INFO] [stdout] 1315 | |         Trie {
[INFO] [stdout] 1316 | |             children: HashMap::new(),
[INFO] [stdout] 1317 | |             is_end_of_word: false,
[INFO] [stdout] 1318 | |         }
[INFO] [stdout] 1319 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1313 + impl Default for Trie {
[INFO] [stdout] 1314 +     fn default() -> Self {
[INFO] [stdout] 1315 +         Self::new()
[INFO] [stdout] 1316 +     }
[INFO] [stdout] 1317 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1325:65
[INFO] [stdout]      |
[INFO] [stdout] 1325 |             current = current.children.entry(ch).or_insert_with(|| Trie::new());
[INFO] [stdout]      |                                                                 ^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `Trie::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout]      = note: `#[warn(clippy::redundant_closure)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `WordDictionary`
[INFO] [stdout]     --> src/main.rs:1409:5
[INFO] [stdout]      |
[INFO] [stdout] 1409 | /     pub fn new() -> Self {
[INFO] [stdout] 1410 | |         WordDictionary {
[INFO] [stdout] 1411 | |             children: HashMap::new(),
[INFO] [stdout] 1412 | |             is_end: false,
[INFO] [stdout] 1413 | |         }
[INFO] [stdout] 1414 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1408 + impl Default for WordDictionary {
[INFO] [stdout] 1409 +     fn default() -> Self {
[INFO] [stdout] 1410 +         Self::new()
[INFO] [stdout] 1411 +     }
[INFO] [stdout] 1412 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1423:33
[INFO] [stdout]      |
[INFO] [stdout] 1423 |                 .or_insert_with(|| WordDictionary::new());
[INFO] [stdout]      |                                 ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `WordDictionary::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1446:29
[INFO] [stdout]      |
[INFO] [stdout] 1446 |                     None => return false,
[INFO] [stdout]      |                             ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1446 -                     None => return false,
[INFO] [stdout] 1446 +                     None => false,
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]     --> src/main.rs:1438:28
[INFO] [stdout]      |
[INFO] [stdout] 1438 |                     if dfs(&child, chars, index + 1) {
[INFO] [stdout]      |                            ^^^^^^ help: change this to: `child`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1475:69
[INFO] [stdout]      |
[INFO] [stdout] 1475 |                 current = current.children.entry(ch).or_insert_with(|| Trie::new());
[INFO] [stdout]      |                                                                     ^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `Trie::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1498:13
[INFO] [stdout]      |
[INFO] [stdout] 1498 |             return;
[INFO] [stdout]      |             ^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1497 -         if (row >= board.len() || col >= board[0].len()) || board[row][col] == '#' {
[INFO] [stdout] 1498 -             return;
[INFO] [stdout] 1497 +         if (row >= board.len() || col >= board[0].len()) || board[row][col] == '#' {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
[INFO] [stdout]     --> src/main.rs:1487:16
[INFO] [stdout]      |
[INFO] [stdout] 1487 |         board: &mut Vec<Vec<char>>,
[INFO] [stdout]      |                ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]      |
[INFO] [stdout] 1487 -         board: &mut Vec<Vec<char>>,
[INFO] [stdout] 1487 +         board: &mut [Vec<char>],
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1517:5
[INFO] [stdout]      |
[INFO] [stdout] 1517 |     return vec![];
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1517 -     return vec![];
[INFO] [stdout] 1517 +     vec![]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `prices`
[INFO] [stdout]     --> src/main.rs:1565:14
[INFO] [stdout]      |
[INFO] [stdout] 1565 |     for i in 0..prices.len() {
[INFO] [stdout]      |              ^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1565 -     for i in 0..prices.len() {
[INFO] [stdout] 1565 +     for <item> in &prices {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1632:9
[INFO] [stdout]      |
[INFO] [stdout] 1632 |         return hrs_taken < hours;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1632 -         return hrs_taken < hours;
[INFO] [stdout] 1632 +         hrs_taken < hours
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1645:5
[INFO] [stdout]      |
[INFO] [stdout] 1645 |     low as i32
[INFO] [stdout]      |     ^^^^^^^^^^ help: try: `low`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1663:9
[INFO] [stdout]      |
[INFO] [stdout] 1663 |         return days_taken <= days;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1663 -         return days_taken <= days;
[INFO] [stdout] 1663 +         days_taken <= days
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1709:5
[INFO] [stdout]      |
[INFO] [stdout] 1709 |     length as i32
[INFO] [stdout]      |     ^^^^^^^^^^^^^ help: try: `length`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1723:13
[INFO] [stdout]      |
[INFO] [stdout] 1723 |             return f_n[n as usize];
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1723 -             return f_n[n as usize];
[INFO] [stdout] 1723 +             f_n[n as usize]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1741:5
[INFO] [stdout]      |
[INFO] [stdout] 1741 |     return dp[n as usize];
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1741 -     return dp[n as usize];
[INFO] [stdout] 1741 +     dp[n as usize]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1751:5
[INFO] [stdout]      |
[INFO] [stdout] 1751 |     return dp[n];
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1751 -     return dp[n];
[INFO] [stdout] 1751 +     dp[n]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`usize` -> `usize`)
[INFO] [stdout]     --> src/main.rs:1745:36
[INFO] [stdout]      |
[INFO] [stdout] 1745 |     let mut dp: Vec<i32> = vec![0; (cost.len() + 1) as usize];
[INFO] [stdout]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `((cost.len() + 1))`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1764:5
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     return prev1 as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1764 -     return prev1 as i32;
[INFO] [stdout] 1764 +     prev1 as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]     --> src/main.rs:1759:14
[INFO] [stdout]      |
[INFO] [stdout] 1759 |     for i in 2..n {
[INFO] [stdout]      |              ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1759 -     for i in 2..n {
[INFO] [stdout] 1759 +     for <item> in nums.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1764:12
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     return prev1 as i32;
[INFO] [stdout]      |            ^^^^^^^^^^^^ help: try: `prev1`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1776:5
[INFO] [stdout]      |
[INFO] [stdout] 1776 |     return max_reach >= (n - 1) as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1776 -     return max_reach >= (n - 1) as i32;
[INFO] [stdout] 1776 +     max_reach >= (n - 1) as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1803:5
[INFO] [stdout]      |
[INFO] [stdout] 1803 |     return ans1.max(ans2);
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1803 -     return ans1.max(ans2);
[INFO] [stdout] 1803 +     ans1.max(ans2)
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1797:9
[INFO] [stdout]      |
[INFO] [stdout] 1797 |         return prev1 as i32;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1797 -         return prev1 as i32;
[INFO] [stdout] 1797 +         prev1 as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `range`
[INFO] [stdout]     --> src/main.rs:1792:18
[INFO] [stdout]      |
[INFO] [stdout] 1792 |         for i in 2..n {
[INFO] [stdout]      |                  ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1792 -         for i in 2..n {
[INFO] [stdout] 1792 +         for <item> in range.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1797:16
[INFO] [stdout]      |
[INFO] [stdout] 1797 |         return prev1 as i32;
[INFO] [stdout]      |                ^^^^^^^^^^^^ help: try: `prev1`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1838:5
[INFO] [stdout]      |
[INFO] [stdout] 1838 |     return dp[n] as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1838 -     return dp[n] as i32;
[INFO] [stdout] 1838 +     dp[n] as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`usize` -> `usize`)
[INFO] [stdout]     --> src/main.rs:1825:26
[INFO] [stdout]      |
[INFO] [stdout] 1825 |     let mut dp = vec![0; (n+1) as usize];
[INFO] [stdout]      |                          ^^^^^^^^^^^^^^ help: try: `((n+1))`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]     --> src/main.rs:1831:14
[INFO] [stdout]      |
[INFO] [stdout] 1831 |     for i in 2..n {
[INFO] [stdout]      |              ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1831 -     for i in 2..n {
[INFO] [stdout] 1831 +     for <item> in nums.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]     --> src/main.rs:1862:36
[INFO] [stdout]      |
[INFO] [stdout] 1862 |         if encode[i - 2] != '0' && (num >= 10 && num <= 26) {
[INFO] [stdout]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `(10..=26).contains(&num)`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout]      = note: `#[warn(clippy::manual_range_contains)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this operation has no effect
[INFO] [stdout]     --> src/main.rs:1880:21
[INFO] [stdout]      |
[INFO] [stdout] 1880 |     let mut prev1 = 1 * freq.get(&1).unwrap_or(&0);
[INFO] [stdout]      |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `*freq.get(&1).unwrap_or(&0)`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_op
[INFO] [stdout]      = note: `#[warn(clippy::identity_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/main.rs:1480:9
[INFO] [stdout]      |
[INFO] [stdout] 1480 |     let mut output: Vec<String> = vec![];
[INFO] [stdout]      |         ----^^^^^^
[INFO] [stdout]      |         |
[INFO] [stdout]      |         help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]     --> src/main.rs:1457:19
[INFO] [stdout]      |
[INFO] [stdout] 1457 | pub fn find_words(board: Vec<Vec<char>>, words: Vec<String>) -> Vec<String> {
[INFO] [stdout]      |                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `output`
[INFO] [stdout]     --> src/main.rs:1491:9
[INFO] [stdout]      |
[INFO] [stdout] 1491 |         output: Vec<String>,
[INFO] [stdout]      |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_output`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/main.rs:1827:9
[INFO] [stdout]      |
[INFO] [stdout] 1827 |     let mut length = 2;
[INFO] [stdout]      |         ----^^^^^^
[INFO] [stdout]      |         |
[INFO] [stdout]      |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]     --> src/main.rs:1823:50
[INFO] [stdout]      |
[INFO] [stdout] 1823 | pub fn max_value_after_partition(nums: Vec<i32>, k: i32) -> i32 {
[INFO] [stdout]      |                                                  ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]     --> src/main.rs:1827:9
[INFO] [stdout]      |
[INFO] [stdout] 1827 |     let mut length = 2;
[INFO] [stdout]      |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `prev2` is never read
[INFO] [stdout]     --> src/main.rs:1846:21
[INFO] [stdout]      |
[INFO] [stdout] 1846 |     let mut prev2 = 0;
[INFO] [stdout]      |                     ^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout]      = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `traverse_board` is never used
[INFO] [stdout]     --> src/main.rs:1486:8
[INFO] [stdout]      |
[INFO] [stdout] 1486 |     fn traverse_board(
[INFO] [stdout]      |        ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: importing legacy numeric constants
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::i32;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: remove this import
[INFO] [stdout]   = note: then `i32::<CONST>` will resolve to the respective associated constant
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
[INFO] [stdout]   = note: `#[warn(clippy::legacy_numeric_constants)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]   --> src/main.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 68 |     low as i32
[INFO] [stdout]    |     ^^^^^^^^^^ help: try: `low`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/main.rs:82:5
[INFO] [stdout]    |
[INFO] [stdout] 82 |     return students;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 82 -     return students;
[INFO] [stdout] 82 +     students
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:103:5
[INFO] [stdout]     |
[INFO] [stdout] 103 |     result as i32
[INFO] [stdout]     |     ^^^^^^^^^^^^^ help: try: `result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: returning the result of a `let` binding from a block
[INFO] [stdout]    --> src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let count = upper_bound - lower_bound;
[INFO] [stdout]     |     -------------------------------------- unnecessary `let` binding
[INFO] [stdout] 141 |
[INFO] [stdout] 142 |     count
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stdout]     = note: `#[warn(clippy::let_and_return)]` on by default
[INFO] [stdout] help: return the expression directly
[INFO] [stdout]     |
[INFO] [stdout] 140 ~     
[INFO] [stdout] 141 |
[INFO] [stdout] 142 ~     upper_bound - lower_bound
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:107:26
[INFO] [stdout]     |
[INFO] [stdout] 107 |     fn lower_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout]     |                          ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]     = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 107 -     fn lower_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout] 107 +     fn lower_bound(nums: &[i32], target: i32) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:122:26
[INFO] [stdout]     |
[INFO] [stdout] 122 |     fn upper_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout]     |                          ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 122 -     fn upper_bound(nums: &Vec<i32>, target: i32) -> i32 {
[INFO] [stdout] 122 +     fn upper_bound(nums: &[i32], target: i32) -> i32 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:216:5
[INFO] [stdout]     |
[INFO] [stdout] 216 |     return length as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 216 -     return length as i32;
[INFO] [stdout] 216 +     length as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `chars`
[INFO] [stdout]    --> src/main.rs:202:14
[INFO] [stdout]     |
[INFO] [stdout] 202 |     for i in 0..chars.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout]     = note: `#[warn(clippy::needless_range_loop)]` on by default
[INFO] [stdout] help: consider using an iterator and enumerate()
[INFO] [stdout]     |
[INFO] [stdout] 202 -     for i in 0..chars.len() {
[INFO] [stdout] 202 +     for (i, <item>) in chars.iter().enumerate() {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     return length as i32;
[INFO] [stdout]     |            ^^^^^^^^^^^^^ help: try: `length`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 |     return min_energy as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 241 -     return min_energy as i32;
[INFO] [stdout] 241 +     min_energy as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:241:12
[INFO] [stdout]     |
[INFO] [stdout] 241 |     return min_energy as i32;
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^ help: try: `min_energy`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 |     return max_len as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 275 -     return max_len as i32;
[INFO] [stdout] 275 +     max_len as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:354:5
[INFO] [stdout]     |
[INFO] [stdout] 354 |     return (max_char, max_freq);
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 354 -     return (max_char, max_freq);
[INFO] [stdout] 354 +     (max_char, max_freq)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:387:5
[INFO] [stdout]     |
[INFO] [stdout] 387 |     if freq1 == freq2 { true } else { false }
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `freq1 == freq2`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout]     = note: `#[warn(clippy::needless_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]    --> src/main.rs:399:14
[INFO] [stdout]     |
[INFO] [stdout] 399 |     for i in 0..nums.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]     |
[INFO] [stdout] 399 -     for i in 0..nums.len() {
[INFO] [stdout] 399 +     for <item> in &nums {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]    --> src/main.rs:409:5
[INFO] [stdout]     |
[INFO] [stdout] 409 |     count as i32
[INFO] [stdout]     |     ^^^^^^^^^^^^ help: try: `count`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:431:5
[INFO] [stdout]     |
[INFO] [stdout] 431 |     return max_len as i32;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 431 -     return max_len as i32;
[INFO] [stdout] 431 +     max_len as i32
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]    --> src/main.rs:463:14
[INFO] [stdout]     |
[INFO] [stdout] 463 |     for i in 0..nums.len() {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]     |
[INFO] [stdout] 463 -     for i in 0..nums.len() {
[INFO] [stdout] 463 +     for <item> in &nums {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:509:5
[INFO] [stdout]     |
[INFO] [stdout] 509 |     return false;
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 509 -     return false;
[INFO] [stdout] 509 +     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `if let` to pattern match a bool
[INFO] [stdout]    --> src/main.rs:502:12
[INFO] [stdout]     |
[INFO] [stdout] 502 |         if let true = frequency.contains(&num) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the condition directly: `frequency.contains(&num)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
[INFO] [stdout]     = note: `#[warn(clippy::redundant_pattern_matching)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:554:9
[INFO] [stdout]     |
[INFO] [stdout] 554 |         return true;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 554 -         return true;
[INFO] [stdout] 554 +         true
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:556:9
[INFO] [stdout]     |
[INFO] [stdout] 556 |         return false;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 556 -         return false;
[INFO] [stdout] 556 +         false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:553:5
[INFO] [stdout]     |
[INFO] [stdout] 553 | /     if s_freq == t_freq {
[INFO] [stdout] 554 | |         return true;
[INFO] [stdout] 555 | |     } else {
[INFO] [stdout] 556 | |         return false;
[INFO] [stdout] 557 | |     }
[INFO] [stdout]     | |_____^ help: you can reduce it to: `return s_freq == t_freq`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
[INFO] [stdout]    --> src/main.rs:645:19
[INFO] [stdout]     |
[INFO] [stdout] 645 | fn add_edge(tree: &mut Vec<Vec<i32>>, u: i32, v: i32) {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]     |
[INFO] [stdout] 645 - fn add_edge(tree: &mut Vec<Vec<i32>>, u: i32, v: i32) {
[INFO] [stdout] 645 + fn add_edge(tree: &mut [Vec<i32>], u: i32, v: i32) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:676:21
[INFO] [stdout]     |
[INFO] [stdout] 676 |                     return false;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 676 -                     return false;
[INFO] [stdout] 676 +                     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: match expression looks like `matches!` macro
[INFO] [stdout]    --> src/main.rs:681:21
[INFO] [stdout]     |
[INFO] [stdout] 681 | /                     match (check_left, check_right) {
[INFO] [stdout] 682 | |                         (true, true) => true,
[INFO] [stdout] 683 | |                         _ => false,
[INFO] [stdout] 684 | |                     }
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_like_matches_macro
[INFO] [stdout]     = note: `#[warn(clippy::match_like_matches_macro)]` on by default
[INFO] [stdout] help: use `matches!` directly
[INFO] [stdout]     |
[INFO] [stdout] 681 -                     match (check_left, check_right) {
[INFO] [stdout] 682 -                         (true, true) => true,
[INFO] [stdout] 683 -                         _ => false,
[INFO] [stdout] 684 -                     }
[INFO] [stdout] 681 +                     matches!((check_left, check_right), (true, true))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/main.rs:749:17
[INFO] [stdout]     |
[INFO] [stdout] 749 |                 return check_balance(&n.left) && check_balance(&n.right);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 749 -                 return check_balance(&n.left) && check_balance(&n.right);
[INFO] [stdout] 749 +                 check_balance(&n.left) && check_balance(&n.right)
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:754:5
[INFO] [stdout]     |
[INFO] [stdout] 754 |     if check_balance(&root) { true } else { false }
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `check_balance(&root)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/main.rs:799:18
[INFO] [stdout]     |
[INFO] [stdout] 799 |         prefix = String::from(test);
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `test`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]     = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: equality checks against true are unnecessary
[INFO] [stdout]    --> src/main.rs:881:16
[INFO] [stdout]     |
[INFO] [stdout] 881 |             if left_to_right == true {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^ help: try: `left_to_right`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stdout]     = note: `#[warn(clippy::bool_comparison)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression returns a bool literal
[INFO] [stdout]    --> src/main.rs:950:21
[INFO] [stdout]     |
[INFO] [stdout] 950 | /                     if compare_subtree(&n1.left, &n2.left) && compare_subtree(&n1.right, &n2.right)
[INFO] [stdout] 951 | |                     {
[INFO] [stdout] 952 | |                         true
[INFO] [stdout] 953 | |                     } else {
[INFO] [stdout] 954 | |                         false
[INFO] [stdout] 955 | |                     }
[INFO] [stdout]     | |_____________________^ help: you can reduce it to: `compare_subtree(&n1.left, &n2.left) && compare_subtree(&n1.right, &n2.right)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]    --> src/main.rs:981:17
[INFO] [stdout]     |
[INFO] [stdout] 981 | /                 if node.val == sub_root_value {
[INFO] [stdout] 982 | |                     if compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout] 983 | |                         res = true;
[INFO] [stdout] 984 | |                         break;
[INFO] [stdout] 985 | |                     }
[INFO] [stdout] 986 | |                 }
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout]     = note: `#[warn(clippy::collapsible_if)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]     |
[INFO] [stdout] 981 ~                 if node.val == sub_root_value
[INFO] [stdout] 982 ~                     && compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout] 983 |                         res = true;
[INFO] [stdout] 984 |                         break;
[INFO] [stdout] 985 ~                     }
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]    --> src/main.rs:982:64
[INFO] [stdout]     |
[INFO] [stdout] 982 |                     if compare_subtree(&Some(node_rc.clone()), &sub_root) {
[INFO] [stdout]     |                                                                ^^^^^^^^^ help: change this to: `sub_root`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout]     = note: `#[warn(clippy::needless_borrow)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]     --> src/main.rs:1006:9
[INFO] [stdout]      |
[INFO] [stdout] 1006 | /         match node {
[INFO] [stdout] 1007 | |             Some(ref_cell) => {
[INFO] [stdout] 1008 | |                 let n = ref_cell.borrow();
[INFO] [stdout] 1009 | |                 max_el = if n.val > max_el {
[INFO] [stdout] ...    |
[INFO] [stdout] 1019 | |             None => {}
[INFO] [stdout] 1020 | |         }
[INFO] [stdout]      | |_________^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]      = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]      |
[INFO] [stdout] 1006 ~         if let Some(ref_cell) = node {
[INFO] [stdout] 1007 +             let n = ref_cell.borrow();
[INFO] [stdout] 1008 +             max_el = if n.val > max_el {
[INFO] [stdout] 1009 +                 *results += 1;
[INFO] [stdout] 1010 +                 n.val
[INFO] [stdout] 1011 +             } else {
[INFO] [stdout] 1012 +                 max_el
[INFO] [stdout] 1013 +             };
[INFO] [stdout] 1014 +             println!("{}", max_el);
[INFO] [stdout] 1015 +             count_nodes(&n.left, results, max_el);
[INFO] [stdout] 1016 +             count_nodes(&n.right, results, max_el);
[INFO] [stdout] 1017 +         }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `clone` on type `i32` which implements the `Copy` trait
[INFO] [stdout]     --> src/main.rs:1058:27
[INFO] [stdout]      |
[INFO] [stdout] 1058 |                 let val = n.val.clone();
[INFO] [stdout]      |                           ^^^^^^^^^^^^^ help: try removing the `clone` call: `n.val`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stdout]      = note: `#[warn(clippy::clone_on_copy)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `Codec`
[INFO] [stdout]     --> src/main.rs:1076:5
[INFO] [stdout]      |
[INFO] [stdout] 1076 | /     pub fn new() -> Self {
[INFO] [stdout] 1077 | |         Codec
[INFO] [stdout] 1078 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout]      = note: `#[warn(clippy::new_without_default)]` on by default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1075 + impl Default for Codec {
[INFO] [stdout] 1076 +     fn default() -> Self {
[INFO] [stdout] 1077 +         Self::new()
[INFO] [stdout] 1078 +     }
[INFO] [stdout] 1079 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `clone` on type `i32` which implements the `Copy` trait
[INFO] [stdout]     --> src/main.rs:1090:31
[INFO] [stdout]      |
[INFO] [stdout] 1090 |                     let val = n.val.clone();
[INFO] [stdout]      |                               ^^^^^^^^^^^^^ help: try removing the `clone` call: `n.val`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1197:17
[INFO] [stdout]      |
[INFO] [stdout] 1197 |                 return validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max);
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1197 -                 return validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max);
[INFO] [stdout] 1197 +                 validate(&n.left, min, Some(val)) && validate(&n.right, Some(val), max)
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `map_or` can be simplified
[INFO] [stdout]     --> src/main.rs:1190:20
[INFO] [stdout]      |
[INFO] [stdout] 1190 |                 if min.map_or(false, |m| val <= m) {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
[INFO] [stdout]      = note: `#[warn(clippy::unnecessary_map_or)]` on by default
[INFO] [stdout] help: use `is_some_and` instead
[INFO] [stdout]      |
[INFO] [stdout] 1190 -                 if min.map_or(false, |m| val <= m) {
[INFO] [stdout] 1190 +                 if min.is_some_and(|m| val <= m) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `map_or` can be simplified
[INFO] [stdout]     --> src/main.rs:1193:20
[INFO] [stdout]      |
[INFO] [stdout] 1193 |                 if max.map_or(false, |m| val >= m) {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_map_or
[INFO] [stdout] help: use `is_some_and` instead
[INFO] [stdout]      |
[INFO] [stdout] 1193 -                 if max.map_or(false, |m| val >= m) {
[INFO] [stdout] 1193 +                 if max.is_some_and(|m| val >= m) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1243:9
[INFO] [stdout]      |
[INFO] [stdout] 1243 |         return -1;
[INFO] [stdout]      |         ^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1243 -         return -1;
[INFO] [stdout] 1243 +         -1
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1245:9
[INFO] [stdout]      |
[INFO] [stdout] 1245 |         return *order.iter().max().unwrap();
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1245 -         return *order.iter().max().unwrap();
[INFO] [stdout] 1245 +         *order.iter().max().unwrap()
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]     --> src/main.rs:1288:20
[INFO] [stdout]      |
[INFO] [stdout] 1288 |                 if !node.left.is_none() {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^ help: try: `node.left.is_some()`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]      = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]     --> src/main.rs:1292:20
[INFO] [stdout]      |
[INFO] [stdout] 1292 |                 if !node.right.is_none() {
[INFO] [stdout]      |                    ^^^^^^^^^^^^^^^^^^^^^ help: try: `node.right.is_some()`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1305:5
[INFO] [stdout]      |
[INFO] [stdout] 1305 |     answer_level as i32
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^ help: try: `answer_level`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `Trie`
[INFO] [stdout]     --> src/main.rs:1314:5
[INFO] [stdout]      |
[INFO] [stdout] 1314 | /     pub fn new() -> Self {
[INFO] [stdout] 1315 | |         Trie {
[INFO] [stdout] 1316 | |             children: HashMap::new(),
[INFO] [stdout] 1317 | |             is_end_of_word: false,
[INFO] [stdout] 1318 | |         }
[INFO] [stdout] 1319 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1313 + impl Default for Trie {
[INFO] [stdout] 1314 +     fn default() -> Self {
[INFO] [stdout] 1315 +         Self::new()
[INFO] [stdout] 1316 +     }
[INFO] [stdout] 1317 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1325:65
[INFO] [stdout]      |
[INFO] [stdout] 1325 |             current = current.children.entry(ch).or_insert_with(|| Trie::new());
[INFO] [stdout]      |                                                                 ^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `Trie::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout]      = note: `#[warn(clippy::redundant_closure)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `WordDictionary`
[INFO] [stdout]     --> src/main.rs:1409:5
[INFO] [stdout]      |
[INFO] [stdout] 1409 | /     pub fn new() -> Self {
[INFO] [stdout] 1410 | |         WordDictionary {
[INFO] [stdout] 1411 | |             children: HashMap::new(),
[INFO] [stdout] 1412 | |             is_end: false,
[INFO] [stdout] 1413 | |         }
[INFO] [stdout] 1414 | |     }
[INFO] [stdout]      | |_____^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout] help: try adding this
[INFO] [stdout]      |
[INFO] [stdout] 1408 + impl Default for WordDictionary {
[INFO] [stdout] 1409 +     fn default() -> Self {
[INFO] [stdout] 1410 +         Self::new()
[INFO] [stdout] 1411 +     }
[INFO] [stdout] 1412 + }
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1423:33
[INFO] [stdout]      |
[INFO] [stdout] 1423 |                 .or_insert_with(|| WordDictionary::new());
[INFO] [stdout]      |                                 ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `WordDictionary::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1446:29
[INFO] [stdout]      |
[INFO] [stdout] 1446 |                     None => return false,
[INFO] [stdout]      |                             ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1446 -                     None => return false,
[INFO] [stdout] 1446 +                     None => false,
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this expression creates a reference which is immediately dereferenced by the compiler
[INFO] [stdout]     --> src/main.rs:1438:28
[INFO] [stdout]      |
[INFO] [stdout] 1438 |                     if dfs(&child, chars, index + 1) {
[INFO] [stdout]      |                            ^^^^^^ help: change this to: `child`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant closure
[INFO] [stdout]     --> src/main.rs:1475:69
[INFO] [stdout]      |
[INFO] [stdout] 1475 |                 current = current.children.entry(ch).or_insert_with(|| Trie::new());
[INFO] [stdout]      |                                                                     ^^^^^^^^^^^^^^ help: replace the closure with the associated function itself: `Trie::new`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1498:13
[INFO] [stdout]      |
[INFO] [stdout] 1498 |             return;
[INFO] [stdout]      |             ^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1497 -         if (row >= board.len() || col >= board[0].len()) || board[row][col] == '#' {
[INFO] [stdout] 1498 -             return;
[INFO] [stdout] 1497 +         if (row >= board.len() || col >= board[0].len()) || board[row][col] == '#' {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
[INFO] [stdout]     --> src/main.rs:1487:16
[INFO] [stdout]      |
[INFO] [stdout] 1487 |         board: &mut Vec<Vec<char>>,
[INFO] [stdout]      |                ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout] help: change this to
[INFO] [stdout]      |
[INFO] [stdout] 1487 -         board: &mut Vec<Vec<char>>,
[INFO] [stdout] 1487 +         board: &mut [Vec<char>],
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1517:5
[INFO] [stdout]      |
[INFO] [stdout] 1517 |     return vec![];
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1517 -     return vec![];
[INFO] [stdout] 1517 +     vec![]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `prices`
[INFO] [stdout]     --> src/main.rs:1565:14
[INFO] [stdout]      |
[INFO] [stdout] 1565 |     for i in 0..prices.len() {
[INFO] [stdout]      |              ^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1565 -     for i in 0..prices.len() {
[INFO] [stdout] 1565 +     for <item> in &prices {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1632:9
[INFO] [stdout]      |
[INFO] [stdout] 1632 |         return hrs_taken < hours;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1632 -         return hrs_taken < hours;
[INFO] [stdout] 1632 +         hrs_taken < hours
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1645:5
[INFO] [stdout]      |
[INFO] [stdout] 1645 |     low as i32
[INFO] [stdout]      |     ^^^^^^^^^^ help: try: `low`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1663:9
[INFO] [stdout]      |
[INFO] [stdout] 1663 |         return days_taken <= days;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1663 -         return days_taken <= days;
[INFO] [stdout] 1663 +         days_taken <= days
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1709:5
[INFO] [stdout]      |
[INFO] [stdout] 1709 |     length as i32
[INFO] [stdout]      |     ^^^^^^^^^^^^^ help: try: `length`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1723:13
[INFO] [stdout]      |
[INFO] [stdout] 1723 |             return f_n[n as usize];
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1723 -             return f_n[n as usize];
[INFO] [stdout] 1723 +             f_n[n as usize]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1741:5
[INFO] [stdout]      |
[INFO] [stdout] 1741 |     return dp[n as usize];
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1741 -     return dp[n as usize];
[INFO] [stdout] 1741 +     dp[n as usize]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1751:5
[INFO] [stdout]      |
[INFO] [stdout] 1751 |     return dp[n];
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1751 -     return dp[n];
[INFO] [stdout] 1751 +     dp[n]
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`usize` -> `usize`)
[INFO] [stdout]     --> src/main.rs:1745:36
[INFO] [stdout]      |
[INFO] [stdout] 1745 |     let mut dp: Vec<i32> = vec![0; (cost.len() + 1) as usize];
[INFO] [stdout]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `((cost.len() + 1))`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1764:5
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     return prev1 as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1764 -     return prev1 as i32;
[INFO] [stdout] 1764 +     prev1 as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]     --> src/main.rs:1759:14
[INFO] [stdout]      |
[INFO] [stdout] 1759 |     for i in 2..n {
[INFO] [stdout]      |              ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1759 -     for i in 2..n {
[INFO] [stdout] 1759 +     for <item> in nums.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1764:12
[INFO] [stdout]      |
[INFO] [stdout] 1764 |     return prev1 as i32;
[INFO] [stdout]      |            ^^^^^^^^^^^^ help: try: `prev1`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1776:5
[INFO] [stdout]      |
[INFO] [stdout] 1776 |     return max_reach >= (n - 1) as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1776 -     return max_reach >= (n - 1) as i32;
[INFO] [stdout] 1776 +     max_reach >= (n - 1) as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1803:5
[INFO] [stdout]      |
[INFO] [stdout] 1803 |     return ans1.max(ans2);
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1803 -     return ans1.max(ans2);
[INFO] [stdout] 1803 +     ans1.max(ans2)
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1797:9
[INFO] [stdout]      |
[INFO] [stdout] 1797 |         return prev1 as i32;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1797 -         return prev1 as i32;
[INFO] [stdout] 1797 +         prev1 as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `range`
[INFO] [stdout]     --> src/main.rs:1792:18
[INFO] [stdout]      |
[INFO] [stdout] 1792 |         for i in 2..n {
[INFO] [stdout]      |                  ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1792 -         for i in 2..n {
[INFO] [stdout] 1792 +         for <item> in range.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`i32` -> `i32`)
[INFO] [stdout]     --> src/main.rs:1797:16
[INFO] [stdout]      |
[INFO] [stdout] 1797 |         return prev1 as i32;
[INFO] [stdout]      |                ^^^^^^^^^^^^ help: try: `prev1`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]     --> src/main.rs:1838:5
[INFO] [stdout]      |
[INFO] [stdout] 1838 |     return dp[n] as i32;
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]      |
[INFO] [stdout] 1838 -     return dp[n] as i32;
[INFO] [stdout] 1838 +     dp[n] as i32
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting to the same type is unnecessary (`usize` -> `usize`)
[INFO] [stdout]     --> src/main.rs:1825:26
[INFO] [stdout]      |
[INFO] [stdout] 1825 |     let mut dp = vec![0; (n+1) as usize];
[INFO] [stdout]      |                          ^^^^^^^^^^^^^^ help: try: `((n+1))`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `nums`
[INFO] [stdout]     --> src/main.rs:1831:14
[INFO] [stdout]      |
[INFO] [stdout] 1831 |     for i in 2..n {
[INFO] [stdout]      |              ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]      |
[INFO] [stdout] 1831 -     for i in 2..n {
[INFO] [stdout] 1831 +     for <item> in nums.iter().take(n).skip(2) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]     --> src/main.rs:1862:36
[INFO] [stdout]      |
[INFO] [stdout] 1862 |         if encode[i - 2] != '0' && (num >= 10 && num <= 26) {
[INFO] [stdout]      |                                    ^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `(10..=26).contains(&num)`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout]      = note: `#[warn(clippy::manual_range_contains)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this operation has no effect
[INFO] [stdout]     --> src/main.rs:1880:21
[INFO] [stdout]      |
[INFO] [stdout] 1880 |     let mut prev1 = 1 * freq.get(&1).unwrap_or(&0);
[INFO] [stdout]      |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `*freq.get(&1).unwrap_or(&0)`
[INFO] [stdout]      |
[INFO] [stdout]      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_op
[INFO] [stdout]      = note: `#[warn(clippy::identity_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.62s
[INFO] running `Command { std: "docker" "inspect" "f1ab6756285c2207ffde7cc7a6d674ba4b91bf158cbaeed2c47fae352492ca09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1ab6756285c2207ffde7cc7a6d674ba4b91bf158cbaeed2c47fae352492ca09", kill_on_drop: false }`
[INFO] [stdout] f1ab6756285c2207ffde7cc7a6d674ba4b91bf158cbaeed2c47fae352492ca09