856. Score of Parentheses

class Solution {
    public int scoreOfParentheses(String s) {
        int score = 0;
        int depth = 0;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == '(') {
                depth++;
            } else {
                depth--;
                // Direct "()" pair found
                if (s.charAt(i - 1) == '(') {
                    score += 1 << depth;
                }
            }
        }
        return score;
    }
}

class Solution:
    def scoreOfParentheses(self, s: str) -> int:
        score = 0
        depth = 0

        for i in range(len(s)):
            if s[i] == '(':
                depth += 1
            else:
                depth -= 1

                if s[i - 1] == '(':
                    score += 1 << depth

        return score

class Solution {
public:
    int scoreOfParentheses(string s) {
        int score = 0;
        int depth = 0;

        for (int i = 0; i < s.length(); i++) {
            if (s[i] == '(') {
                depth++;
            } else {
                depth--;

                if (s[i - 1] == '(') {
                    score += 1 << depth;
                }
            }
        }

        return score;
    }
};

class Solution {
    scoreOfParentheses(s) {
        let score = 0;
        let depth = 0;

        for (let i = 0; i < s.length; i++) {
            if (s[i] === '(') {
                depth++;
            } else {
                depth--;

                if (s[i - 1] === '(') {
                    score += 1 << depth;
                }
            }
        }

        return score;
    }
}