stonewall.js

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(H) {
    // write your code in JavaScript (Node.js 6.4.0)
    let len = H.length;
    if (len === 1) return 1;
    let low = 0;
    let stack = [];
    let tmp = 0, count=0, countB=0;
    for(let i=0;i<len;i++) {
        let h = H[i];
        if (stack.length === 0) {
            tmp = h;
            stack.unshift(h); continue;
        }
        if (stack[0] !== h) {
            // console.log('h:'+h, 'tmp:'+tmp, h - tmp >= 0 ? 'muat' : 'gk muat')
            if (h - tmp >= 0) {
                tmp = h
                stack.unshift(h);
                count++;
            } else {
                if (count > 0) count--
                countB++;
                tmp = tmp + h-tmp
                stack.unshift(h);
            }
        } else {
            tmp -= h
        }
    }
    // console.log(stack, stack.length, count)
    return stack.length - count;
}