某旅馆有n 个等级的房间，第i 等级有个房间，每个等级有个床位（1≤I≤n）。试模拟旅馆管理系统中床位分配

和回收的功能，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 grade i have a room, each grade has a bed (1 ≤ I ≤ n). Simulation test bed hotel management system distribution and recovery of function, design for a single passenger allocation of beds will be recovered in its check-out bed (for the next allocation) algorithms.