#include <iostream>
#include <algorithm>
 
void ShowAllPermutationsFromFirst(std::string first_permutation_string) {
  while (std::next_permutation(first_permutation_string.begin(),
                               first_permutation_string.end())) {
    std::cout << first_permutation_string << '\n';
  }
}
 
std::string CreateFirstPermutation(size_t number_of_zeros,
                                   size_t number_of_ones) {
  std::string zeros_string(number_of_zeros, '0');
  std::string ones_string(number_of_ones, '1');
  return zeros_string + ones_string;
}
 
void ShowPermutations(size_t number_of_zeros, size_t number_of_ones) {
  ShowAllPermutationsFromFirst(
      CreateFirstPermutation(number_of_zeros, number_of_ones));
}
 
int main() {
  ShowPermutations(2, 2);
  return 0;
}

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