有一种游戏叫“24点牌戏”，大家应该很熟悉，给出已知的4个整数，通过加减乘除四则运算符号和括号，使其结果等于24（也可以指定等于其他的），很适合学习算法的入门同学！-There is a game called " 24 point card game" , we should be very familiar with, given the known four integers, multiplication and division through addition and subtraction arithmetic symbols, and parentheses, so the result is equal to 24 (can also specify equal to others), it is learning algorithm for introductory students!