1
function reverse(s) {
2
  return s.split("").reverse().join("");
3
}
4

5
function solve(s, index) {
6
  let ans = "";
7
  let j = index;
8
  while (j < s.length) {
9
    if (s[j] == "(") {
10
      let store = solve(s, j + 1);
11
      ans += store.ans;
12
      j = store.j;
13
    } else if (s[j] == ")") return { ans: reverse(ans), j };
14
    else ans += s[j];
15
    j++;
16
  }
17

18
  return ans;
19
}
20

21
var reverseParentheses = function (s) {
22
  return solve(s, 0);
23
};