功能: 用回溯算法求解883喝酒问题。注意: 该程序尽可能用与算法一致的思路实现算法, 力求简单明了, 注重算法的清晰性-Function: The retrospective algorithm 883 alcohol problem. NOTE: The procedures and algorithms as much as possible consistent with the idea of algorithm to simple algorithms focus on the clarity