Compilare: warning: unused imports: `Read`, `cmp::max`, `self` --> main.rs:1:11 | 1 | use std::{cmp::max, collections::VecDeque, fs::{self, File, OpenOptions}, io::{BufRead, BufReader, BufWriter, Read, Write}}; | ^^^^^^^^ ^^^^ ^^^^ | = note: `#[warn(unused_imports)]` on by default warning: unnecessary parentheses around `if` condition --> main.rs:84:23 | 84 | } else if (dist[w as usize] == -1 && dist[u] < path_len) { | ^ ^ | = note: `#[warn(unused_parens)]` on by default help: remove these parentheses | 84 - } else if (dist[w as usize] == -1 && dist[u] < path_len) { 84 + } else if dist[w as usize] == -1 && dist[u] < path_len { | warning: variable does not need to be mutable --> main.rs:18:9 | 18 | let mut file = File::open("date.in").unwrap(); | ----^^^^ | | | help: remove this `mut` | = note: `#[warn(unused_mut)]` on by default warning: function `read_graph` is never used --> main.rs:3:4 | 3 | fn read_graph(rdr: &mut BufReader<File>, l: usize, k: usize) -> Vec<Vec<usize>> { | ^^^^^^^^^^ | = note: `#[warn(dead_code)]` on by default warning: unused `Result` that must be used --> main.rs:7:9 | 7 | rdr.read_line(&mut line); | ^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this `Result` may be an `Err` variant, which should be handled = note: `#[warn(unused_must_use)]` on by default help: use `let _ = ...` to ignore the resulting value | 7 | let _ = rdr.read_line(&mut line);