leetcode#32. Longest Valid Parentheses(未解決)
給定一個只包含 ‘(‘ 和 ‘)’ 的字符串,找出最長的包含有效括號的子串的長度。
示例 1:
輸入: "(()"
輸出: 2
解釋: 最長有效括號子串為 "()"
示例 2:
輸入: ")()())"
輸出: 4
解釋: 最長有效括號子串為 "()()"
class Solution {
public:
int longestValidParentheses(string s) {
//等待解決
}
};
leetcode#32. Longest Valid Parentheses(未解決)
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先來看一下問題描述 分析: 1.考慮用棧來進行輔助,每次遇'('進行入棧,當遇')'時進行判斷,如果棧非空,那麼將棧頂元素所對應序號處的'('對應為當前遇到的')'(也就是說我們首先找到了離得最近的滿足條件的左右括號,後續判斷的時候從最短距離兩端進行擴充套件判斷