I m getting no response on submitting the code

#include<bits/stdc++.h>
using namespace std;
char arr[100];
vector vec;

bool compare(string a,string b){
return a>b;
}

void GenerateParenthesis(int n,int opening,int closing,int pos){

if(pos == 2*n){
    arr[pos] = '\0';
    vec.push_back(arr);
    return;
}
else{

    if(opening < n){
        arr[pos] = '(';
        GenerateParenthesis(n,opening+1,closing,pos+1);
    }
    if(closing < opening){
        arr[pos] = ')';
        GenerateParenthesis(n,opening,closing+1,pos+1);
    }
}

}

int main(){

int n;
cin>>n;
GenerateParenthesis(n,0,0,0);
sort(vec.begin(),vec.end(),compare);
for(string x : vec){
    cout<<x<<endl;
}
return 0;

}