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
【leetcode_easy_stack】1021. Remove Outermost Parentheses
原文：https://www.cnblogs.com/happyamyhope/p/14030265.html