class Solution {

public:

    bool isValid(string s) {

        if(s.empty() || s == "")

            return true;

        if(s.size()%!= )

            return false;

        int i = ;

        stack<char> myStack;

        while(i!=s.size())

        {

            if(s[i] == '(' || s[i] == '{' || s[i] == '[')

                myStack.push(s[i]);

            else

            {

                if(myStack.empty())

                    return false;

                char chStackTop = myStack.top();

                myStack.pop();

                if(s[i]== ')' && chStackTop!= '(' || s[i]== '}' && chStackTop!= '{' ||s[i]== ']' && chStackTop!= '[' )

                    return false;

                else if(s[i]!= ')' &&  s[i]!= '}' && s[i]!= ']')

                    return false;

            }

            i++;

        }

        if(myStack.empty())

            return true;

        else

            return false;

    }

};