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class Solution { public: bool isValid(string s) { stack<char> st; bool is_valid = true; for(int i = 0; i < (int) s.size(); i++) { char c = s[i]; if(c == '(' or c == '[' or c == '{') { st.push(c); } else { if(st.empty()) { is_valid = false; break; } if(c == ')' and st.top() != '(') { is_valid = false; break; } if(c == ']' and st.top() != '[') { is_valid = false; break; } if(c == '}' and st.top() != '{') { is_valid = false; break; } st.pop(); } } if(st.empty() and is_valid) { return true; } return false; } };
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