1A2B是一种猜数字游戏，通常由两个人玩。其中一个人先想一个四位数字，然后另一个人猜。猜的人每猜一个四位数字，出题人就要给出几A几B的回答。其中，A表示有几个数字位置对了，B表示有几个数字对了但位置不对。 例如，如果出题人想的数字是“2587”，猜题人猜了“3852”，出题人要回答1A2B，其中有一个数字位置对了（即数位“5”），另外两个数位（“2”和“8”）对了但位置不对。猜题人依据回答继续猜测，直到猜中整个数字。 1A2B is a guessing game that is usually played by two people. One person thinks of a four-digit number, and the other person tries to guess it. After each guess, the person who came up with the number responds with a "score" of sorts, in the form of how many "A"s and "B"s the guesser has earned. An "A" indicates that a digit in the guess is in the correct position, while a "B" indicates that a digit is correct, but in the wrong position. For example, if the number to be guessed is "2587" and the guesser tries "3852," the person who came up with the number would respond with "1A2B," indicating that one digit (the "5") is in the correct position, and two other digits (the "2" and "8") are correct, but in the wrong position. The guesser uses this feedback to continue guessing until they correctly guess the entire number