LeetCode #1021. Remove Outermost Parentheses 删除最外层的括号

https://leetcode-cn.com/problems/remove-outermost-parentheses/

Java Solution

 class Solution {
     public String removeOuterParentheses(String S) {
         char[] chars = S.toCharArray();
         int flag = 0;
         StringBuilder result = new StringBuilder();

         for (char c : chars) {
             if (c == '(') {
                 if (flag == 0) {
                     flag ++;
                     continue;
                 }
                 flag ++;
             } else if (c == ')') {
                 flag --;
                 if (flag == 0) {
                     continue;
                 }
             }
             result.append(c);
         }
         return result.toString();
     }
 }