Compilare: warning: unused import: `std::fs` --> main.rs:1:5 | 1 | use std::fs; | ^^^^^^^ | = note: `#[warn(unused_imports)]` on by default warning: unused import: `Read` --> main.rs:3:53 | 3 | use std::io::{BufRead, BufReader, BufWriter, Write, Read}; | ^^^^ warning: unused import: `std::cmp` --> main.rs:4:5 | 4 | use std::cmp; | ^^^^^^^^ warning: variable `FIN` should have a snake case name --> main.rs:10:13 | 10 | let mut FIN = BufReader::new(File::open("royfloyd.in").unwrap()); | ^^^ help: convert the identifier to snake case: `fin` | = note: `#[warn(non_snake_case)]` on by default warning: variable `FOUT` should have a snake case name --> main.rs:11:13 | 11 | let mut FOUT = BufWriter::new(File::create("royfloyd.out").unwrap()); | ^^^^ help: convert the identifier to snake case: `fout` warning: unused `std::result::Result` that must be used --> main.rs:47:13 | 47 | FOUT.write(format!("{} ", dist[i][j]).as_bytes()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `#[warn(unused_must_use)]` on by default = note: this `Result` may be an `Err` variant, which should be handled warning: unused `std::result::Result` that must be used --> main.rs:50:9 | 50 | FOUT.write(format!("\n").as_bytes()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this `Result` may be an `Err` variant, which should be handled