Răspuns:
#include <fstream>
#include <cmath>
using namespace std;
ifstream cin("puteri6.in");
ofstream cout("puteri6.out");
int f[10];
int main()
{
int n , x;
cin >> n;
while(cin >> x)
{
int p = 0;
while(x)
p++ , x/=10;
f[p-1]++;
}
for(int i = 0 ; i <= 9 && n != 0; ++i)
{
for(int j = 1 ; j <= f[i] && n != 0; ++j)
{
n--;
if(n==0)
cout << pow(10 , i);
}
}
if(n > 0)
cout << "Nu exista";
return 0;
}
