解决时钟问题，acm竞赛题 A weird clock marked from 0 to 59 has only a minute hand. It won t move until a special coin is thrown into its box. There are different kinds of coins as your options. However once you make your choice, you cannot use any other kind.

数据结构课程设计（图的遍历和生成树求解实现）-operation system choice(gra,G,d)