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 ")()())",
where the longest valid parentheses substring is "()()",
which has length = 4.
最长有效括号子串

本文介绍了一种高效算法来寻找给定字符串中最长的有效括号子串的长度。通过遍历字符并利用栈结构记录左括号的位置,算法能够处理只有'('和')'的字符串,找到最长的有效括号序列。
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