某旅馆有n个等级的房间，第i等级有a个房间，每个等级有b个床位（１<=i<=n）. 模拟旅馆个管理系统中床位的分配和回收功能，设计能为单个旅客分配床位，在其离店便回收床位（供下次分配）的算法 -A hotel has n levels of the room, the first i have a level of rooms, each grade there are b-bed (1 <= i <= n). Simulated hotel management