Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example is
Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring. For"(()", the longest valid parentheses substring is"()", which has length = 2. Another example is")
Lua的标识符包含数字,字母以及下划线,数字不能作为标识符的开头. and break do else elseif end false for function goto if in local nil not or repeat return then true until while 以上不能作为关键字,和java不同的有goto,local,nil,repeat,until. Lua区分大小写.按照惯例,下划线开头,后跟大写字母为Lua的保留字. + - * / % ^ # == ~=
1. Valid Parentheses 题目链接 题目要求: Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but &q