#include <iostream>
#include <unordered_set>
#include <string>
std::unordered_set<std::string> generate_2_digit_permutations_from_3_digit_number(const std::string& threeDigitNumber) {
std::unordered_set<std::string> twoDigitPermutations;
// Generate all two_digit_permutations of three_digit_number
for (size_t i = 0; i < threeDigitNumber.length(); i++) {
for (size_t j = 0; j < threeDigitNumber.length(); j++) {
if (i != j) {
twoDigitPermutations.insert(std::string(1, threeDigitNumber[i]) + std::string(1, threeDigitNumber[j]));
}
}
}
return twoDigitPermutations;
}
int main() {
std::string threeDigitNumber = "185";
std::unordered_set<std::string> twoDigitPermutations = generate_2_digit_permutations_from_3_digit_number(threeDigitNumber);
for (const auto& permutation : twoDigitPermutations) {
std::cout << permutation << " ";
}
std::cout << std::endl;
}
/*
run:
58 51 85 81 15 18
*/
