Leetcode: Valid Parentheses

与 POJ 上那道括号匹配相比, 这道可谓简单

思路:

堆栈存储符号, 遇到匹配弹出

代码:

#include <iostream>
#include <stack>
using namespace std;

class Solution {
public:
    bool isValid(string s) {
		stack<char> record;
		for(int i = 0; i < s.size(); i ++) {
			if(record.empty()) {
				record.push(s[i]);
			}else{
				if((s[i] == '(' && record.top()==')') || (s[i] == '[' && record.top()==']') || (s[i] == '{' && record.top() == '}'))
					record.pop();
				else{
					record.push(s[i]);
				}
			}
		}
		return record.empty();
    }
};