Leetcode Problem.20—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.
My C++ solution！
bool isValid(string s){int len=s.length();if(len%2)return false;stack<char> st;int i=1;st.push(s[0]); while(i<len){if(st.empty())st.push(s[i]);else {if(s[i]-st.top()>2||s[i]-st.top()<1)st.push(s[i]); elsest.pop();}i++;}return st.size()==0?true:false;} 0 0
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