Leetcode Valid Parentheses

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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) {        if(s.length()%2) return false;        stack<char> bracket;        for(int i = 0 ; i < s.length(); ++ i){            if(s[i]==‘(‘ || s[i]==‘{‘ || s[i] == ‘[‘) bracket.push(s[i]);            else{                if(bracket.empty()) return false;                else{                    if((s[i] == ‘)‘ && bracket.top() == ‘(‘) ||                        (s[i] == ‘}‘ && bracket.top() == ‘{‘) ||                       (s[i] == ‘]‘ && bracket.top() == ‘[‘))                       bracket.pop();                     else return false;                }            }        }        if(bracket.empty()) return true;        else return false;    }};