Longest Valid Parentheses
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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.
class Solution {public: int longestValidParentheses(string s) { int n = s.length(); int result = 0; if (n < 2) { return 0; } int buf[n+1]; memset(buf, 0, (n+1)*sizeof(int)); int count = 0; for (int i = 1; i <= n; i++) { if (s[i-1] == '(') { count++; } else if (count > 0) { count--; buf[i] = 2; if (s[i-2] == ')') { buf[i] += buf[i-1]; } buf[i] += buf[i-buf[i]]; if (buf[i] > result) { result = buf[i]; } } } return result; }}; 0 0
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