[leetcode]Valid Parentheses题解
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描述
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
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.
利用一个栈来保存前括号，然后有后括号来时弹出栈顶来判断
bool isValid (string s){stack<char> k;for (string::size_type index =0;index!=s.size();++index){if (s[index]=='('||s[index]=='{'||s[index]=='['){k.push(s[index]);}else{switch(s[index]){case ')':if (!k.empty()&&k.top()=='('){k.pop();} else return false; break;case '}':if (!k.empty()&&k.top()=='{') { k.pop(); } else return false; break;case ']':if (!k.empty()&&k.top()=='[') { k.pop(); } else return false; break;}}}return k.empty();} 0 0
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