Leetcode_Valid Parentheses
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> myStack; for(int i = 0; i< s.length(); i++) { switch(s[i]){ case '{': case '[': case '(': myStack.push(s[i]); break; case ')':{ if(myStack.empty() ||myStack.top() != '(' ) return false; myStack.pop(); break; } case ']': { if(myStack.empty() ||myStack.top() != '[' ) return false; myStack.pop(); break; } case '}': { if(myStack.empty() ||myStack.top() != '{' ) return false; myStack.pop(); break; } default : return false; } } if(myStack.empty()) return true; else return false; } };
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