#include <iostream> int main() { for (int ab = 10; ab <= 99; ++ab) { for (int cd = 10; cd <= 99; ++cd) { int product = ab * cd; if (product < 1000 || product > 9999 || product % 1000 != 809) { continue; } int c = cd / 10; int d = cd % 10; int partial1 = ab * d; int partial2 = ab * c; if (partial1 >= 100 && partial1 <= 999 && partial2 >= 100 && partial2 <= 999) { std::cout << ab << "\n" << product << "\n" << cd << "\n" << partial1 << "\n" << partial2; return 0; } } } return 0; }