Key cutting

#!allow(unused)
use std::io::stdin;
 
fn take_int() -> usize {
    let mut input = String::new();
    stdin().read_line(&mut input).unwrap();
    return input.trim().parse().unwrap();
}
 
fn take_vector() -> Vec<usize> {
    let mut input = String::new();
    stdin().read_line(&mut input).unwrap();
    let arr: Vec<usize> = input.trim().split_whitespace().map(|x| x.parse().unwrap()).collect();
    arr
}
 
fn solve(lista: Vec<usize>) -> usize {
    // println!("{:?}", lista);
    if lista.len() == 0 {
        return 0
    }
/*     if lista.len() == 1 {
        return 1
    } */
    if !lista.contains(&0) {
        let minu = *lista.iter().min().unwrap();
        // println!("{}", minu);
        let mut new: Vec<usize> = Vec::new();
        for elem in lista.iter() {
            new.push(*elem - minu);
        }
        return 1 + solve(new);
    }
    else {
        let a:usize = lista.iter().position(|&x| x==0).unwrap();
        let b = a+1;
/*         let l = lista.len();
        while b < l {
            if lista[b] == 0 {
                break
            } else {
                b += 1;
            }
        } */
 
        return solve(lista[..a].to_vec()) + solve(lista[b..].to_vec());
    }
 
}
 
fn main() {
    let _ = take_int();
    let lista = take_vector();
    println!("{}", solve(lista))
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR

Test 11

Verdict: RUNTIME ERROR

Test 12

Verdict: RUNTIME ERROR

Test 13

Verdict: RUNTIME ERROR

Test 14

Verdict: ACCEPTED