rustgym 0.2.0

rustgym solutions
Documentation 
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struct Solution;

impl Solution {
    fn max_width_ramp(a: Vec<i32>) -> i32 {
        let mut stack: Vec<usize> = vec![];
        let n = a.len();
        for i in 0..n {
            if let Some(&j) = stack.last() {
                if a[i] < a[j] {
                    stack.push(i);
                }
            } else {
                stack.push(i);
            }
        }
        let mut res = 0;
        for i in (0..n).rev() {
            while let Some(&j) = stack.last() {
                if a[j] <= a[i] {
                    res = res.max(i - j);
                    stack.pop();
                } else {
                    break;
                }
            }
        }
        res as i32
    }
}

#[test]
fn test() {
    let a = vec![6, 0, 8, 2, 1, 5];
    let res = 4;
    assert_eq!(Solution::max_width_ramp(a), res);
    let a = vec![9, 8, 1, 0, 1, 9, 4, 0, 4, 1];
    let res = 7;
    assert_eq!(Solution::max_width_ramp(a), res);
}