Other algorithms are similar to this algorithm, which is a variant of this algorithm, so there is only one algorithm.

Chess puzzle game requires that the result is equal to 24! This game is easier to play with playing cards. Take a deck of cards, draw out the queen (you can also take J/Q/K for the first practice), leaving 40 cards (1 ~ 10 instead of A). Randomly draw 4 cards (called deck cards), and use addition, subtraction, multiplication and division (brackets can be added) to calculate the number on the card face as 24. Each card can only be used once. (if J/Q/K is added, then j stands for 1 1, q stands for 12, and k stands for 13).