标签：solution closed als ble sam tar ems note else
https://leetcode.com/problems/valid-parentheses/description/
Given a string containing just the characters ‘(‘, ‘)‘, ‘{‘, ‘}‘, ‘[‘ and ‘]‘, determine if the input string is valid.
An input string is valid if:
Note that an empty string is also considered valid.
Example 1:
Input: "()" Output: true
Example 2:
Input: "()[]{}"
Output: true
Example 3:
Input: "(]" Output: false
Example 4:
Input: "([)]" Output: false
Example 5:
Input: "{[]}"
Output: true
代码：
class Solution {
public:
bool isValid(string s) {
int len = s.length();
stack<char> Sta;
for(int i = 0; i <len; i ++) {
if(s[i] == ‘(‘ || s[i] == ‘[‘ || s[i] == ‘{‘)
Sta.push(s[i]);
else {
if(Sta.empty()) return false;
if(s[i] == ‘)‘ && Sta.top() != ‘(‘) return false;
if(s[i] == ‘]‘ && Sta.top() != ‘[‘) return false;
if(s[i] == ‘}‘ && Sta.top() != ‘{‘) return false;
Sta.pop();
}
}
if(Sta.empty()) return true;
else return false;
}
};
#Leetcode# 20.Valid Parentheses
标签：solution closed als ble sam tar ems note else
原文地址：https://www.cnblogs.com/zlrrrr/p/9903258.html
