[Leetcode] Valid Parentheses
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class Solution {public: bool isValid(string s) { // Start typing your C/C++ solution below // DO NOT write int main() function stack<char> buf; for (int i = 0; i < s.size(); ++i) { switch(s[i]) { case '(': buf.push(s[i]); break; case '{': buf.push(s[i]); break; case '[': buf.push(s[i]); break; case ')': if (!buf.empty() && buf.top() == '(') { buf.pop(); } else return false; break; case '}': if (!buf.empty() && buf.top() == '{') { buf.pop(); } else return false; break; case ']': if (!buf.empty() && buf.top() == '[') { buf.pop(); } else return false; break; } } if (buf.empty()) return true; else return false; }};- LeetCode: Valid Parentheses
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