LeetCode Valid Parentheses
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题目：
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) { bool flag = true; stack<char> par; for(int i = 0; i < s.size(); i++) { if(s[i] == '(' || s[i] == '[' || s[i] == '{') par.push(s[i]); else if(par.empty()) { flag = false; break; } else if(s[i] == ')' && par.top() == '(') par.pop();else if(s[i] == ']' && par.top() == '[')par.pop();else if (s[i] == '}' && par.top() == '{') par.pop(); else { flag = false; break; } } return (par.empty() && flag); }}; 0 0
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