1021. Remove Outermost Parentheses

![https://leetcode.com/problems/remove-outermost-parentheses/] A valid parentheses string is either empty (""), “(” + A + “)”, or A + B, where A and B are valid parentheses strings, and + represents string concatenation. For example, “”, “()”, “(())()”, and “(()(()))” are all valid parentheses strings. A valid parentheses string S is primitive if it is nonempty, and there does not exist a way to split it into S = A+B, with A and B nonempty valid parentheses strings. ...

January 26, 2021 · 2 min · volyx