猜猜房子里有几个人：随机出现M个人从左边进入房子，随机N 个人从右边离开房子，一段时间后，输入房子中的人数。系统判断是否正确-Guess the house a few people: M individuals randomly from the left to enter the house, randomly N individuals from the right to leave the house, after a period of time, enter the house number. System to determine whether the correct