Use enumeration (exhaustive) method to solve number guessing games

This calculator uses an enumeration (also called exhaustive) algorithm and can solve the "guess the number" game included with some electronic dictionaries.

What is the "guess the number" game?
The questioner thinks of four different integers between 0 and 9 and arranges them in a certain order. The player guesses 4 numbers, and the question maker answers in the form of "mAnB", where m and n are integers between 0 and 4, m represents the number of numbers that are correct and in the correct position, and n represents the number of numbers that are correct but not in the correct position. Then the player analyzes the question maker's answer, guesses another 4 numbers, and the question maker answers again. The game ends until the player guesses the 4 numbers that the questioner wanted in the same order (that is, when the answer is 4A0B).

Because the enumeration (exhaustive) method is used, the speed may be a bit slow. The first guess may take 10 seconds. Sometimes there may be a "non-response" situation. At this time, the program is concentrating on calculation, please wait patiently.