Longest Valid Parentheses
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class Solution {public: int longestValidParentheses(string s) { const int size = s.size(); int start = -1; int res = 0; stack<int> stackdata; for(int i=0 ; i<size;++i) { if (s[i] == '(') stackdata.push(i); else { if(!stackdata.empty()) { stackdata.pop(); if(!stackdata.empty()) res = max(res, i - stackdata.top()); else res = max(res, i - start); } else start = i; } } return res; }};
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