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using namespace std; class Solution { public: bool isValid(string s) { stack<char> bucket; for (char c : s){ if (c == '(' || c == '{' || c == '['){ bucket.push(c); } else { if (bucket.empty() || !isParentheses(bucket.top(), c)) { return false; } bucket.pop(); } } return bucket.empty(); } private: bool isParentheses(char left, char right){ if (left == '(' && right == ')') return true; if (left == '{' && right == '}') return true; if (left == '[' && right == ']') return true; return false; } };
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