1
var scoreOfParentheses = function (s) {
2
  let len = s.length,
3
    pwr = 0,
4
    ans = 0;
5

6
  for (let i = 1; i < len; i++) {
7
    if (s.charAt(i) === "(") {
8
      pwr++;
9
    } else if (s.charAt(i - 1) === "(") {
10
      ans += 1 << pwr--;
11
    } else {
12
      pwr--;
13
    }
14
  }
15

16
  return ans;
17
};