package courses30.lessons12909;

import java.util.Stack;

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

        for (int i = 0; i < s.length(); i++) {
            switch (s.charAt(i)) {
                case '(':
                    stack.add(s.charAt(i));
                    break;
                case ')':
                    if (stack.isEmpty()) {
                        return false;
                    }

                    if (stack.peek() == '(') {
                        stack.pop();
                    } else {
                        return false;
                    }
                    break;
            }
        }

        return stack.isEmpty();
    }

    public static void main(String[] args) {
        System.out.println(new Solution().solution("()()"));
    }
}