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class Solution {
   private:    vector
   
     out;    void function(const string &solution, int left, int right, int n){
           if(right == n && left == n){
               out.push_back(solution);            return;        }                if (left
    
     left)			function(solution + "(", left + 1, right, n);		else if(left
     
       generateParenthesis(int n) {
           string solution;        if(n==0)            return out;        function(solution, 0, 0, n);        return out;    }};
     
    
   

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