[INFO] cloning repository https://github.com/mv-kan/leetcode_iq
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mv-kan/leetcode_iq" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmv-kan%2Fleetcode_iq", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmv-kan%2Fleetcode_iq'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9bedb2fed449cebb2af33d3163eb10c1f7fc6f51
[INFO] linting mv-kan/leetcode_iq against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmv-kan%2Fleetcode_iq" "/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/mv-kan/leetcode_iq
[INFO] finished tweaking git repo https://github.com/mv-kan/leetcode_iq
[INFO] tweaked toml for git repo https://github.com/mv-kan/leetcode_iq written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mv-kan/leetcode_iq 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/mv-kan/leetcode_iq 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] 88127c4c1d0bd00f12aca56fd9e2ed242ca30b232ae54f01431980891b591858
[INFO] running `Command { std: "docker" "start" "-a" "88127c4c1d0bd00f12aca56fd9e2ed242ca30b232ae54f01431980891b591858", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88127c4c1d0bd00f12aca56fd9e2ed242ca30b232ae54f01431980891b591858", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88127c4c1d0bd00f12aca56fd9e2ed242ca30b232ae54f01431980891b591858", kill_on_drop: false }`
[INFO] [stdout] 88127c4c1d0bd00f12aca56fd9e2ed242ca30b232ae54f01431980891b591858
[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] 655122ea595f951463dced1c6ab2bbfbf74a97493a394a2d324080ed58b358bd
[INFO] running `Command { std: "docker" "start" "-a" "655122ea595f951463dced1c6ab2bbfbf74a97493a394a2d324080ed58b358bd", kill_on_drop: false }`
[INFO] [stderr]     Checking lc_iq v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/remove_duplicates.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     return nums.len() as i32 - result;
[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] 19 -     return nums.len() as i32 - result;
[INFO] [stdout] 19 +     nums.len() as i32 - result
[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/easy/array/remove_duplicates.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<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] 3 - fn solve(nums: &mut Vec<i32>) -> i32 {
[INFO] [stdout] 3 + fn solve(nums: &mut [i32]) -> i32 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/buy_sell_stock.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     return profit
[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] 14 -     return profit
[INFO] [stdout] 14 +     profit
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `prices`
[INFO] [stdout]  --> src/easy/array/buy_sell_stock.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 6 |     for i in 1..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]   = note: `#[warn(clippy::needless_range_loop)]` on by default
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]   |
[INFO] [stdout] 6 -     for i in 1..prices.len() {
[INFO] [stdout] 6 +     for <item> in prices.iter().skip(1) {
[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/easy/array/rotate_array.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<i32>, k: 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] 3 ~ fn solve(nums: &mut [i32], k: i32) {
[INFO] [stdout] 4 ~     let tmp = nums.to_owned();
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/contains_dulplicates.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     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] 13 -     return false;
[INFO] [stdout] 13 +     false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/contains_dulplicates.rs:7:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for i in 1..tmp.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] 7 -     for i in 1..tmp.len() {
[INFO] [stdout] 7 +     for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/signle_number.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     return prev;
[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] 18 -     return prev;
[INFO] [stdout] 18 +     prev
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/signle_number.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in 1..tmp.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] 8 -     for i in 1..tmp.len() {
[INFO] [stdout] 8 +     for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/intersection_of_two_arrays_ii.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     return inter;
[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] 27 -     return inter;
[INFO] [stdout] 27 +     inter
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/plus_one.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     return result;
[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] 18 -     return result;
[INFO] [stdout] 18 +     result
[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/easy/array/move_zeroes.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<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] 3 - fn solve(nums: &mut Vec<i32>) {
[INFO] [stdout] 3 + fn solve(nums: &mut [i32]) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/two_sum.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     return result
[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] 29 -     return result
[INFO] [stdout] 29 +     result
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]  --> src/easy/array/two_sum.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |     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 and enumerate()
[INFO] [stdout]   |
[INFO] [stdout] 9 -     for i in 0..nums.len() {
[INFO] [stdout] 9 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]   --> src/easy/array/two_sum.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     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 and enumerate()
[INFO] [stdout]    |
[INFO] [stdout] 12 -     for i in 0..nums.len() {
[INFO] [stdout] 12 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` can be collapsed into the outer `match`
[INFO] [stdout]   --> src/easy/array/two_sum.rs:15:17
[INFO] [stdout]    |
[INFO] [stdout] 15 | /                 if idx != i {
[INFO] [stdout] 16 | |                     if idx > i {
[INFO] [stdout] 17 | |                         result.push(i as i32);
[INFO] [stdout] 18 | |                         result.push(idx as i32);
[INFO] [stdout] ...  |
[INFO] [stdout] 23 | |                     return result;
[INFO] [stdout] 24 | |                 } 
[INFO] [stdout]    | |_________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
[INFO] [stdout]    = note: `#[warn(clippy::collapsible_match)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 14 ~             Some(&idx)
[INFO] [stdout] 15 ~                 if idx != i => {
[INFO] [stdout] 16 |                     if idx > i {
[INFO] [stdout] ...
[INFO] [stdout] 23 |                     return result;
[INFO] [stdout] 24 ~                 },
[INFO] [stdout]    |
[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/easy/array/two_sum.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | /         match map.get(&nums[i]) {
[INFO] [stdout] 14 | |             Some(&idx) => {
[INFO] [stdout] 15 | |                 if idx != i {
[INFO] [stdout] 16 | |                     if idx > i {
[INFO] [stdout] ...  |
[INFO] [stdout] 26 | |             _ => {},
[INFO] [stdout] 27 | |         }
[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] 13 ~         if let Some(&idx) = map.get(&nums[i]) {
[INFO] [stdout] 14 +             if idx != i {
[INFO] [stdout] 15 +                 if idx > i {
[INFO] [stdout] 16 +                     result.push(i as i32);
[INFO] [stdout] 17 +                     result.push(idx as i32);
[INFO] [stdout] 18 +                 } else {
[INFO] [stdout] 19 +                     result.push(idx as i32);
[INFO] [stdout] 20 +                     result.push(i as i32);
[INFO] [stdout] 21 +                 }
[INFO] [stdout] 22 +                 return result;
[INFO] [stdout] 23 +             } 
[INFO] [stdout] 24 +         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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] 45 -     return true
[INFO] [stdout] 45 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         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] 14 -         return false;
[INFO] [stdout] 14 +         false
[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/easy/array/valid_sudoku.rs:4:35
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn contains_dulplicates(nums: &Vec<char>) -> bool {
[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] 4 ~     fn contains_dulplicates(nums: &[char]) -> bool {
[INFO] [stdout] 5 ~         let mut tmp = nums.to_owned();
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/valid_sudoku.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 |         for i in 1..tmp.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] 8 -         for i in 1..tmp.len() {
[INFO] [stdout] 8 +         for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `board`
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |     for i in 0..board.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] 18 -     for i in 0..board.len() {
[INFO] [stdout] 18 +     for <item> in &board {
[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/easy/array/rotate_image.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn rotate_outer(matrix: &mut Vec<Vec<i32>>, begin: usize, len: usize) {
[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] 4 -     fn rotate_outer(matrix: &mut Vec<Vec<i32>>, begin: usize, len: usize) {
[INFO] [stdout] 4 +     fn rotate_outer(matrix: &mut [Vec<i32>], begin: usize, len: usize) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 46 |     for i in 0..mat.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] 46 -     for i in 0..mat.len() {
[INFO] [stdout] 46 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:51:14
[INFO] [stdout]    |
[INFO] [stdout] 51 |     for i in 0..mat.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] 51 -     for i in 0..mat.len() {
[INFO] [stdout] 51 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:61:14
[INFO] [stdout]    |
[INFO] [stdout] 61 |     for i in 0..mat.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] 61 -     for i in 0..mat.len() {
[INFO] [stdout] 61 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:66:14
[INFO] [stdout]    |
[INFO] [stdout] 66 |     for i in 0..mat.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] 66 -     for i in 0..mat.len() {
[INFO] [stdout] 66 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:74:14
[INFO] [stdout]    |
[INFO] [stdout] 74 |     for i in 0..mat.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] 74 -     for i in 0..mat.len() {
[INFO] [stdout] 74 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:79:14
[INFO] [stdout]    |
[INFO] [stdout] 79 |     for i in 0..mat.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] 79 -     for i in 0..mat.len() {
[INFO] [stdout] 79 +     for <item> in &mat {
[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/easy/strings/reverse_string.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(s: &mut 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] 3 - fn solve(s: &mut Vec<char>) {
[INFO] [stdout] 3 + fn solve(s: &mut [char]) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/reverse_integer.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     return tmp 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] 16 -     return tmp as i32;
[INFO] [stdout] 16 +     tmp as i32
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]  --> src/easy/strings/reverse_integer.rs:5:19
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut tmp = 0 as i64; 
[INFO] [stdout]   |                   ^^^^^^^^ help: try: `0_i64`
[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: manual implementation of an assign operation
[INFO] [stdout]   --> src/easy/strings/reverse_integer.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         num = num / 10;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: replace it with: `num /= 10`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stdout]    = note: `#[warn(clippy::assign_op_pattern)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/first_unique_char_in_str.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     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] 22 -     return -1;
[INFO] [stdout] 22 +     -1
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `j` is only used to index `chars`
[INFO] [stdout]   --> src/easy/strings/first_unique_char_in_str.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for j in i+1..s.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] 11 -         for j in i+1..s.len() {
[INFO] [stdout] 11 +         for <item> in chars.iter_mut().take(s.len()).skip(i+1) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/valid_anagram.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     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] 16 -     return true
[INFO] [stdout] 16 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/easy/strings/valid_palindrome.rs:8:12
[INFO] [stdout]    |
[INFO] [stdout]  8 |           if (unfiltered[i] >= 65 as char && unfiltered[i] <= 90 as char) || 
[INFO] [stdout]    |  ____________^
[INFO] [stdout]  9 | |             (unfiltered[i] >= 97 as char && unfiltered[i] <= 122 as char) || 
[INFO] [stdout] 10 | |             (unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char) || 
[INFO] [stdout] 11 | |             (unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char) {
[INFO] [stdout]    | |________________________________________________________________________^ help: try: `unfiltered[i] >= 65 as char && unfiltered[i] <= 90 as char || unfiltered[i] >= 97 as char && unfiltered[i] <= 122 as char || unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char`
[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: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/valid_palindrome.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     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] 24 -     return true;
[INFO] [stdout] 24 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `unfiltered`
[INFO] [stdout]  --> src/easy/strings/valid_palindrome.rs:7:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for i in 0..unfiltered.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] 7 -     for i in 0..unfiltered.len() {
[INFO] [stdout] 7 +     for <item> in &unfiltered {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/string_to_int.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     return r 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] 71 -     return r as i32;
[INFO] [stdout] 71 +     r as i32
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `unfil`
[INFO] [stdout]  --> src/easy/strings/string_to_int.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |     for i in 0..unfil.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] 9 -     for i in 0..unfil.len() {
[INFO] [stdout] 9 +     for <item> in &unfil {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]   --> src/easy/strings/string_to_int.rs:54:23
[INFO] [stdout]    |
[INFO] [stdout] 54 |             let ten = 10 as i64;
[INFO] [stdout]    |                       ^^^^^^^^^ help: try: `10_i64`
[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/easy/strings/str_str.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     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] 18 -     return -1
[INFO] [stdout] 18 +     -1
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/longest_common_prefix.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     return res.into_iter().collect();
[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] 23 -     return res.into_iter().collect();
[INFO] [stdout] 23 +     res.into_iter().collect()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `strs`
[INFO] [stdout]  --> src/easy/strings/longest_common_prefix.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 |     for i in 0..strs.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] 5 -     for i in 0..strs.len() {
[INFO] [stdout] 5 +     for <item> in &strs {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `j` is only used to index `vec_of_chars`
[INFO] [stdout]   --> src/easy/strings/longest_common_prefix.rs:12:18
[INFO] [stdout]    |
[INFO] [stdout] 12 |         for j in 1..strs.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] 12 -         for j in 1..strs.len() {
[INFO] [stdout] 12 +         for <item> in vec_of_chars.iter().take(strs.len()).skip(1) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/medium/array/three_sum.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 90 |     return result;
[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] 90 -     return result;
[INFO] [stdout] 90 +     result
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/remove_duplicates.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     return nums.len() as i32 - result;
[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] 19 -     return nums.len() as i32 - result;
[INFO] [stdout] 19 +     nums.len() as i32 - result
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stdout]  --> src/medium/array/three_sum.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut pair_sum: HashMap<i32, Vec<((i32, usize), (i32, usize))>> = HashMap::new();
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stdout]   = note: `#[warn(clippy::type_complexity)]` on by default
[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/easy/array/remove_duplicates.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<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] 3 - fn solve(nums: &mut Vec<i32>) -> i32 {
[INFO] [stdout] 3 + fn solve(nums: &mut [i32]) -> i32 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `or_insert_with` to construct default value
[INFO] [stdout]   --> src/medium/array/three_sum.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 |                     .or_insert_with(Vec::new)
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `or_default()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_or_default
[INFO] [stdout]    = note: `#[warn(clippy::unwrap_or_default)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]   --> src/medium/array/three_sum.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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 and enumerate()
[INFO] [stdout]    |
[INFO] [stdout] 45 -     for i in 0..nums.len() {
[INFO] [stdout] 45 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/buy_sell_stock.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     return profit
[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] 14 -     return profit
[INFO] [stdout] 14 +     profit
[INFO] [stdout]    |
[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/medium/array/three_sum.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 | /         match pair_sum.get(&neg_num) {
[INFO] [stdout] 48 | |             Some(pairs) => {
[INFO] [stdout] 49 | |                 for pair in pairs {
[INFO] [stdout] 50 | |                     let mut triple: Vec<i32> = Vec::with_capacity(3);
[INFO] [stdout] ...  |
[INFO] [stdout] 68 | |             _ => (),
[INFO] [stdout] 69 | |         }
[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] help: try
[INFO] [stdout]    |
[INFO] [stdout] 47 ~         if let Some(pairs) = pair_sum.get(&neg_num) {
[INFO] [stdout] 48 +             for pair in pairs {
[INFO] [stdout] 49 +                 let mut triple: Vec<i32> = Vec::with_capacity(3);
[INFO] [stdout] 50 +                 if pair.0.1 == i {
[INFO] [stdout] 51 +                     continue;
[INFO] [stdout] 52 +                 } else {
[INFO] [stdout] 53 +                     triple.push(pair.0 .0);
[INFO] [stdout] 54 +                 }
[INFO] [stdout] 55 +                 if pair.1.1 == i {
[INFO] [stdout] 56 +                     continue;
[INFO] [stdout] 57 +                 } else {
[INFO] [stdout] 58 +                     triple.push(pair.1 .0);
[INFO] [stdout] 59 +                 }
[INFO] [stdout] 60 +                 triple.push(nums[i]);
[INFO] [stdout] 61 +                 triple.sort();
[INFO] [stdout] 62 +                 if unique_set.insert(triple.clone()) {
[INFO] [stdout] 63 +                     result.push(triple);
[INFO] [stdout] 64 +                 }
[INFO] [stdout] 65 +             }
[INFO] [stdout] 66 +         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `prices`
[INFO] [stdout]  --> src/easy/array/buy_sell_stock.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 6 |     for i in 1..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]   = note: `#[warn(clippy::needless_range_loop)]` on by default
[INFO] [stdout] help: consider using an iterator
[INFO] [stdout]   |
[INFO] [stdout] 6 -     for i in 1..prices.len() {
[INFO] [stdout] 6 +     for <item> in prices.iter().skip(1) {
[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/easy/array/rotate_array.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<i32>, k: 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] 3 ~ fn solve(nums: &mut [i32], k: i32) {
[INFO] [stdout] 4 ~     let tmp = nums.to_owned();
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: consider using `sort`
[INFO] [stdout]   --> src/medium/array/three_sum.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 88 |     result.sort_by(|a, b| a.cmp(b));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_sort_by)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]    |
[INFO] [stdout] 88 -     result.sort_by(|a, b| a.cmp(b));
[INFO] [stdout] 88 +     result.sort();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/contains_dulplicates.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     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] 13 -     return false;
[INFO] [stdout] 13 +     false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/contains_dulplicates.rs:7:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for i in 1..tmp.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] 7 -     for i in 1..tmp.len() {
[INFO] [stdout] 7 +     for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/signle_number.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     return prev;
[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] 18 -     return prev;
[INFO] [stdout] 18 +     prev
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/signle_number.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in 1..tmp.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] 8 -     for i in 1..tmp.len() {
[INFO] [stdout] 8 +     for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/intersection_of_two_arrays_ii.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     return inter;
[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] 27 -     return inter;
[INFO] [stdout] 27 +     inter
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/plus_one.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     return result;
[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] 18 -     return result;
[INFO] [stdout] 18 +     result
[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/easy/array/move_zeroes.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(nums: &mut Vec<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] 3 - fn solve(nums: &mut Vec<i32>) {
[INFO] [stdout] 3 + fn solve(nums: &mut [i32]) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/two_sum.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     return result
[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] 29 -     return result
[INFO] [stdout] 29 +     result
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]  --> src/easy/array/two_sum.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |     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 and enumerate()
[INFO] [stdout]   |
[INFO] [stdout] 9 -     for i in 0..nums.len() {
[INFO] [stdout] 9 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]   --> src/easy/array/two_sum.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 |     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 and enumerate()
[INFO] [stdout]    |
[INFO] [stdout] 12 -     for i in 0..nums.len() {
[INFO] [stdout] 12 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` can be collapsed into the outer `match`
[INFO] [stdout]   --> src/easy/array/two_sum.rs:15:17
[INFO] [stdout]    |
[INFO] [stdout] 15 | /                 if idx != i {
[INFO] [stdout] 16 | |                     if idx > i {
[INFO] [stdout] 17 | |                         result.push(i as i32);
[INFO] [stdout] 18 | |                         result.push(idx as i32);
[INFO] [stdout] ...  |
[INFO] [stdout] 23 | |                     return result;
[INFO] [stdout] 24 | |                 } 
[INFO] [stdout]    | |_________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
[INFO] [stdout]    = note: `#[warn(clippy::collapsible_match)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 14 ~             Some(&idx)
[INFO] [stdout] 15 ~                 if idx != i => {
[INFO] [stdout] 16 |                     if idx > i {
[INFO] [stdout] ...
[INFO] [stdout] 23 |                     return result;
[INFO] [stdout] 24 ~                 },
[INFO] [stdout]    |
[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/easy/array/two_sum.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | /         match map.get(&nums[i]) {
[INFO] [stdout] 14 | |             Some(&idx) => {
[INFO] [stdout] 15 | |                 if idx != i {
[INFO] [stdout] 16 | |                     if idx > i {
[INFO] [stdout] ...  |
[INFO] [stdout] 26 | |             _ => {},
[INFO] [stdout] 27 | |         }
[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] 13 ~         if let Some(&idx) = map.get(&nums[i]) {
[INFO] [stdout] 14 +             if idx != i {
[INFO] [stdout] 15 +                 if idx > i {
[INFO] [stdout] 16 +                     result.push(i as i32);
[INFO] [stdout] 17 +                     result.push(idx as i32);
[INFO] [stdout] 18 +                 } else {
[INFO] [stdout] 19 +                     result.push(idx as i32);
[INFO] [stdout] 20 +                     result.push(i as i32);
[INFO] [stdout] 21 +                 }
[INFO] [stdout] 22 +                 return result;
[INFO] [stdout] 23 +             } 
[INFO] [stdout] 24 +         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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] 45 -     return true
[INFO] [stdout] 45 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         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] 14 -         return false;
[INFO] [stdout] 14 +         false
[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/easy/array/valid_sudoku.rs:4:35
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn contains_dulplicates(nums: &Vec<char>) -> bool {
[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] 4 ~     fn contains_dulplicates(nums: &[char]) -> bool {
[INFO] [stdout] 5 ~         let mut tmp = nums.to_owned();
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `tmp`
[INFO] [stdout]  --> src/easy/array/valid_sudoku.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 |         for i in 1..tmp.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] 8 -         for i in 1..tmp.len() {
[INFO] [stdout] 8 +         for <item> in tmp.iter().skip(1) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `board`
[INFO] [stdout]   --> src/easy/array/valid_sudoku.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |     for i in 0..board.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] 18 -     for i in 0..board.len() {
[INFO] [stdout] 18 +     for <item> in &board {
[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/easy/array/rotate_image.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn rotate_outer(matrix: &mut Vec<Vec<i32>>, begin: usize, len: usize) {
[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] 4 -     fn rotate_outer(matrix: &mut Vec<Vec<i32>>, begin: usize, len: usize) {
[INFO] [stdout] 4 +     fn rotate_outer(matrix: &mut [Vec<i32>], begin: usize, len: usize) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 46 |     for i in 0..mat.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] 46 -     for i in 0..mat.len() {
[INFO] [stdout] 46 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:51:14
[INFO] [stdout]    |
[INFO] [stdout] 51 |     for i in 0..mat.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] 51 -     for i in 0..mat.len() {
[INFO] [stdout] 51 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:61:14
[INFO] [stdout]    |
[INFO] [stdout] 61 |     for i in 0..mat.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] 61 -     for i in 0..mat.len() {
[INFO] [stdout] 61 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:66:14
[INFO] [stdout]    |
[INFO] [stdout] 66 |     for i in 0..mat.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] 66 -     for i in 0..mat.len() {
[INFO] [stdout] 66 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:74:14
[INFO] [stdout]    |
[INFO] [stdout] 74 |     for i in 0..mat.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] 74 -     for i in 0..mat.len() {
[INFO] [stdout] 74 +     for <item> in &mat {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `mat`
[INFO] [stdout]   --> src/easy/array/rotate_image.rs:79:14
[INFO] [stdout]    |
[INFO] [stdout] 79 |     for i in 0..mat.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] 79 -     for i in 0..mat.len() {
[INFO] [stdout] 79 +     for <item> in &mat {
[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/easy/strings/reverse_string.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn solve(s: &mut 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] 3 - fn solve(s: &mut Vec<char>) {
[INFO] [stdout] 3 + fn solve(s: &mut [char]) {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/reverse_integer.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     return tmp 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] 16 -     return tmp as i32;
[INFO] [stdout] 16 +     tmp as i32
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]  --> src/easy/strings/reverse_integer.rs:5:19
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut tmp = 0 as i64; 
[INFO] [stdout]   |                   ^^^^^^^^ help: try: `0_i64`
[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: manual implementation of an assign operation
[INFO] [stdout]   --> src/easy/strings/reverse_integer.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         num = num / 10;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: replace it with: `num /= 10`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stdout]    = note: `#[warn(clippy::assign_op_pattern)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/first_unique_char_in_str.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     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] 22 -     return -1;
[INFO] [stdout] 22 +     -1
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `j` is only used to index `chars`
[INFO] [stdout]   --> src/easy/strings/first_unique_char_in_str.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for j in i+1..s.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] 11 -         for j in i+1..s.len() {
[INFO] [stdout] 11 +         for <item> in chars.iter_mut().take(s.len()).skip(i+1) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/valid_anagram.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     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] 16 -     return true
[INFO] [stdout] 16 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/easy/strings/valid_palindrome.rs:8:12
[INFO] [stdout]    |
[INFO] [stdout]  8 |           if (unfiltered[i] >= 65 as char && unfiltered[i] <= 90 as char) || 
[INFO] [stdout]    |  ____________^
[INFO] [stdout]  9 | |             (unfiltered[i] >= 97 as char && unfiltered[i] <= 122 as char) || 
[INFO] [stdout] 10 | |             (unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char) || 
[INFO] [stdout] 11 | |             (unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char) {
[INFO] [stdout]    | |________________________________________________________________________^ help: try: `unfiltered[i] >= 65 as char && unfiltered[i] <= 90 as char || unfiltered[i] >= 97 as char && unfiltered[i] <= 122 as char || unfiltered[i] >= 48 as char && unfiltered[i] <= 57 as char`
[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: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/valid_palindrome.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     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] 24 -     return true;
[INFO] [stdout] 24 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `unfiltered`
[INFO] [stdout]  --> src/easy/strings/valid_palindrome.rs:7:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     for i in 0..unfiltered.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] 7 -     for i in 0..unfiltered.len() {
[INFO] [stdout] 7 +     for <item> in &unfiltered {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/string_to_int.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     return r 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] 71 -     return r as i32;
[INFO] [stdout] 71 +     r as i32
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `unfil`
[INFO] [stdout]  --> src/easy/strings/string_to_int.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |     for i in 0..unfil.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] 9 -     for i in 0..unfil.len() {
[INFO] [stdout] 9 +     for <item> in &unfil {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]   --> src/easy/strings/string_to_int.rs:54:23
[INFO] [stdout]    |
[INFO] [stdout] 54 |             let ten = 10 as i64;
[INFO] [stdout]    |                       ^^^^^^^^^ help: try: `10_i64`
[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/easy/strings/str_str.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     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] 18 -     return -1
[INFO] [stdout] 18 +     -1
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/easy/strings/longest_common_prefix.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     return res.into_iter().collect();
[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] 23 -     return res.into_iter().collect();
[INFO] [stdout] 23 +     res.into_iter().collect()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is only used to index `strs`
[INFO] [stdout]  --> src/easy/strings/longest_common_prefix.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 |     for i in 0..strs.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] 5 -     for i in 0..strs.len() {
[INFO] [stdout] 5 +     for <item> in &strs {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `j` is only used to index `vec_of_chars`
[INFO] [stdout]   --> src/easy/strings/longest_common_prefix.rs:12:18
[INFO] [stdout]    |
[INFO] [stdout] 12 |         for j in 1..strs.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] 12 -         for j in 1..strs.len() {
[INFO] [stdout] 12 +         for <item> in vec_of_chars.iter().take(strs.len()).skip(1) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/medium/array/three_sum.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 90 |     return result;
[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] 90 -     return result;
[INFO] [stdout] 90 +     result
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: very complex type used. Consider factoring parts into `type` definitions
[INFO] [stdout]  --> src/medium/array/three_sum.rs:9:23
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut pair_sum: HashMap<i32, Vec<((i32, usize), (i32, usize))>> = HashMap::new();
[INFO] [stdout]   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
[INFO] [stdout]   = note: `#[warn(clippy::type_complexity)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of `or_insert_with` to construct default value
[INFO] [stdout]   --> src/medium/array/three_sum.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 |                     .or_insert_with(Vec::new)
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `or_default()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_or_default
[INFO] [stdout]    = note: `#[warn(clippy::unwrap_or_default)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the loop variable `i` is used to index `nums`
[INFO] [stdout]   --> src/medium/array/three_sum.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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 and enumerate()
[INFO] [stdout]    |
[INFO] [stdout] 45 -     for i in 0..nums.len() {
[INFO] [stdout] 45 +     for (i, <item>) in nums.iter().enumerate() {
[INFO] [stdout]    |
[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/medium/array/three_sum.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 | /         match pair_sum.get(&neg_num) {
[INFO] [stdout] 48 | |             Some(pairs) => {
[INFO] [stdout] 49 | |                 for pair in pairs {
[INFO] [stdout] 50 | |                     let mut triple: Vec<i32> = Vec::with_capacity(3);
[INFO] [stdout] ...  |
[INFO] [stdout] 68 | |             _ => (),
[INFO] [stdout] 69 | |         }
[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] help: try
[INFO] [stdout]    |
[INFO] [stdout] 47 ~         if let Some(pairs) = pair_sum.get(&neg_num) {
[INFO] [stdout] 48 +             for pair in pairs {
[INFO] [stdout] 49 +                 let mut triple: Vec<i32> = Vec::with_capacity(3);
[INFO] [stdout] 50 +                 if pair.0.1 == i {
[INFO] [stdout] 51 +                     continue;
[INFO] [stdout] 52 +                 } else {
[INFO] [stdout] 53 +                     triple.push(pair.0 .0);
[INFO] [stdout] 54 +                 }
[INFO] [stdout] 55 +                 if pair.1.1 == i {
[INFO] [stdout] 56 +                     continue;
[INFO] [stdout] 57 +                 } else {
[INFO] [stdout] 58 +                     triple.push(pair.1 .0);
[INFO] [stdout] 59 +                 }
[INFO] [stdout] 60 +                 triple.push(nums[i]);
[INFO] [stdout] 61 +                 triple.sort();
[INFO] [stdout] 62 +                 if unique_set.insert(triple.clone()) {
[INFO] [stdout] 63 +                     result.push(triple);
[INFO] [stdout] 64 +                 }
[INFO] [stdout] 65 +             }
[INFO] [stdout] 66 +         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: consider using `sort`
[INFO] [stdout]   --> src/medium/array/three_sum.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 88 |     result.sort_by(|a, b| a.cmp(b));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_sort_by)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]    |
[INFO] [stdout] 88 -     result.sort_by(|a, b| a.cmp(b));
[INFO] [stdout] 88 +     result.sort();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "655122ea595f951463dced1c6ab2bbfbf74a97493a394a2d324080ed58b358bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "655122ea595f951463dced1c6ab2bbfbf74a97493a394a2d324080ed58b358bd", kill_on_drop: false }`
[INFO] [stdout] 655122ea595f951463dced1c6ab2bbfbf74a97493a394a2d324080ed58b358bd