Размещение с повторениями

#include <iostream>
#include <cmath>
 
void printSequence(unsigned long int sequence, int n, int k) {
  while (k--) {
    std::cout << (sequence % n) << " ";
    sequence /= n;
  }
  std::cout << std::endl;
}
 
int main(int argc, char *argv[]) {
  int n = 3;
  int k = 3;
  
  unsigned long int numberOfSequences = pow(n, k);
  for (unsigned long int sequence = 0; sequence < numberOfSequences; ++sequence) {
    std::cout << sequence << " = ";
    printSequence(sequence, n, k);
  }
  std::cout << "Number of sequences = " << numberOfSequences << std::endl;
}

#include <iostream>
#include <vector>
 
using namespace std;
 
int n = 1, k = 4;
vector <int> st(1000);
 
int gen(int pos){
    if (pos == 0) {
        for (int i = k-1; i >= 0; i--)
            printf("%d ", st[i]);
        printf("\n");
        return 1;
    }
    int ans = 0;
    for (int i = 0; i <= n; i++) {
        st[pos-1] = i;
        ans += gen(pos-1);
    }
    return ans;
}
 
int main(){            
    printf("Total: %d", gen(k));
    return 0;
}