[leetcode #20 stack]Valid Parentheses
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Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
class Solution {public: bool isValid(string s) { stack<char> st; for(int i=0;i<s.size();i++) { if(s.at(i) == '('){st.push(')');} else if(s.at(i) == '{'){st.push('}');} else if(s.at(i) == '['){st.push(']');} else { if(true == st.empty() || s.at(i)!=st.top()){return false;} else{st.pop();} } } return st.empty()?true:false; }}; 0 0
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