#include <iostream>
#include <vector>
#include <string>
#include <sstream>
 
using namespace std;
 
int main()
{
    cout << "\nEnter n and n values: \n";
    int n;
    cin >> n;
    vector<int> nums;
    int en = n;
    while (en > 0)
    {
        int x;
        cin >> x;
        nums.push_back(x);
        --en;
    }
 
    ostringstream new_val;
    if (n > 0)
    {
        new_val << nums[0];
        for (int i = 1; i < n; ++i)
            new_val << '0' << nums[i];
    }
 
    cout << new_val.str() << endl;
}

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

MTUgMSAyIDMgNCA1IDYgNyA4IDkgMSAyIDMgNCA1IDYg

15 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6