【leetcode_easy_stack】1021. Remove Outermost Parentheses

problem

1021. Remove Outermost Parentheses

solution#1: stack；

code

solution#2: 

code

参考

1. leetcode_easy_stack_1021. Remove Outermost Parentheses;

2. 【leetcode刷题】1021. Remove Outermost Parentheses;

完