Compilare: warning: unused import: `num` --> main.rs:1:11 | 1 | use std::{num, str::SplitWhitespace}; | ^^^ | = note: `#[warn(unused_imports)]` on by default warning: unused `Result` that must be used --> main.rs:132:13 | 132 | write!(&mut rez, "-1"); | ^^^^^^^^^^^^^^^^^^^^^^ | = note: this `Result` may be an `Err` variant, which should be handled = note: `#[warn(unused_must_use)]` on by default = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info) warning: 2 warnings emitted