Răspuns 1:
#include <iostream>
using namespace std;
int main()
{
int V[11] = {0}, n, k, i, OK = 0;
cin >> n >> k;
while(n){
V[n%10]++;
n = n / 10;
}
for(i = 0; i <= 9; i++)
if(V[i] == k){
cout << i << " ";
OK = 1;
}
if(OK == 0)
cout << "Nu sunt solutii";
return 0;
}