LeetCodeProblems/validParentheses at main · Trillymatt/LeetCodeProblems · GitHub

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class Solution {
public:
    bool isValid(string s) {
        int round = 0;
        int curly = 0;
        int square = 0;

        for (char ch : s) {
            if (ch == '(') {
                round++;
            } else if (ch == ')') {
                round--;
                if  (round < 0) return false;
            }
            if (ch == '{') {
                curly++;
            } else if (ch == '}') {
                curly--;
                if  (curly < 0) return false;
            }
            if (ch == '[') {
                square++;
            } else if (ch == ']') {
                square--;
                if  (square < 0) return false;
            }

            if ((round > 0 && (curly > 0 || square > 0)) ||
            (curly > 0 && (round > 0 || square > 0)) ||
            (square > 0 && (round > 0 || curly > 0))) {
                return false;
            }
        }
        return round == 0 && curly == 0 && square == 0;
    }
};