gkastrinis

#include <stdio.h>
#include <stdlib.h>

// num is the original number
// i is the current digit
// digits is the total number of digits in num
// mask is a number with 'digits' length of 1 and 0
void solve(int num, int i, int digits, int mask, int maxOne) {
	// combine mask and num and print only the digits of num
	// in the places where mask has 1