2675번 문자열 반복

#include <iostream>
#include <string>
#include <sstream>
#include <cstdio>
 
using namespace std;
 
int main()
{
    int numcases;
    cin >> numcases;
 
    while (numcases--)
    {
        int n;
        cin >> n;
 
        string s;
        string result = "";
        cin >> s;
 
        for(int i = 0; i < s.length(); i++) {
            for(int j = 0; j < n; j++) 
                result += s[i];
        }
 
        cout << result << "\n";
    }
 
    return 0;
}