FloodDepth solution

index.js

function solution(A) {
    let start = A[0];
    let depth = 0;
    let result = 0;
    let min = 100000000;
    for (let i = 1; i < A.length; i++) {
        if (A[i] < start) {
            if ((A[i] - min) > depth) {
                depth = A[i] - min;
            }
            if (A[i] < min) {
                min = A[i];
            }
        }
        else {
            depth = start - min;
            if (result < depth) {
                result = depth;
            }
            depth = 0;
            min = 100000000;
            start = A[i];
        }
    }
    if ((!result) || (result < depth)) {
        result = depth;
    }
    return result;
}