#include #include bool is_invalid(long int id) { std::string id_str = std::to_string(id); for (int i = 0; i < id_str.size(); i++) { if (id_str.substr(0, i) + id_str.substr(0, i) == id_str) { return true; } } return false; } int main() { std::ifstream file("input.txt"); long int invalid_sum = 0; std::string range; while (getline(file, range, ',')) { long int range_start, range_end; sscanf(range.c_str(), "%ld-%ld", &range_start, &range_end); std::cout << "Range " << range_start << "-" << range_end << ":"; for (long int i = range_start; i <= range_end; i++) { if (is_invalid(i)) { std::cout << " " << i; invalid_sum += i; } } std::cout << std::endl; } std::cout << "Sum of invalid IDs: " << invalid_sum << std::endl; }