Compilare: warning: unused variable: `stack_1` --> main.rs:18:9 | 18 | let mut stack_1: Vec<usize> = Vec::new(); | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_1` | = note: `#[warn(unused_variables)]` on by default warning: unused variable: `stack_2` --> main.rs:19:9 | 19 | let mut stack_2: Vec<usize> = Vec::new(); | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_2` warning: unused variable: `aux` --> main.rs:20:9 | 20 | let mut aux: Vec<usize> = Vec::new(); | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_aux` warning: variable does not need to be mutable --> main.rs:18:9 | 18 | let mut stack_1: Vec<usize> = Vec::new(); | ----^^^^^^^ | | | help: remove this `mut` | = note: `#[warn(unused_mut)]` on by default warning: variable does not need to be mutable --> main.rs:19:9 | 19 | let mut stack_2: Vec<usize> = Vec::new(); | ----^^^^^^^ | | | help: remove this `mut` warning: variable does not need to be mutable --> main.rs:20:9 | 20 | let mut aux: Vec<usize> = Vec::new(); | ----^^^ | | | help: remove this `mut` warning: variable does not need to be mutable --> main.rs:22:9 | 22 | let mut left_1: Vec<usize> = vec![0; n + 1];