package com.zerroi.leetcode.Three21;

import java.util.Stack;

public class IsValidBracket {
    public static void main(String[] args) {

    }
}

class SolutionFirst {
    public boolean isValid(String s) {
        Stack<Character> stack = new Stack<>();

        for (char c : s.toCharArray()) {
            if (c == '(') stack.push(')');
            else if (c == '[') stack.push(']');
            else if (c == '{') stack.push('}');
            else if (stack.isEmpty() || stack.pop() != c) return false;
        }
        return stack.isEmpty();
    }
}