LeetCode : Valid Parentheses
来源：互联网 发布：2017php笔试 编辑：程序博客网 时间：2024/05/02 00:13
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) { // Start typing your C/C++ solution below // DO NOT write int main() function stack<char> stk; char map[256]; map['('] = ')'; map['['] = ']'; map['{'] = '}'; for(int i = 0; i< s.size(); ++i){ char c = s[i]; if(c == '(' || c == '[' ||c == '{'){ stk.push(c); } else{ if(stk.empty()) return false; char l = stk.top(); if(map[l] == c){ stk.pop(); } else{ return false; } } } if(!stk.empty()){ return false; } return true; }};- LeetCode: Valid Parentheses
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