rustgym 0.2.0

rustgym solutions
Documentation 
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struct Solution;

impl Solution {
    fn trap(height: Vec<i32>) -> i32 {
        let n = height.len();
        if n == 0 {
            return 0;
        }
        let mut l = 0;
        let mut r = n - 1;
        let mut level = 0;
        let mut res = 0;
        while l < r {
            if height[l] < height[r] {
                let lower = height[l];
                level = level.max(lower);
                res += level - lower;
                l += 1;
            } else {
                let lower = height[r];
                level = level.max(lower);
                res += level - lower;
                r -= 1;
            }
        }
        res
    }
}

#[test]
fn test() {
    let height = vec![0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1];
    let res = 6;
    assert_eq!(Solution::trap(height), res);
}