youxi

代码说明：

  人机对弈，互取火柴。取最后一根者输。每次至少取一根，最多取4跟。如果人先取则人必输。如果机先取，则机器等待人出错。否则人胜。(Human-computer game, and take matches. The last one loses. Check at least one of each, with up to 4 check. If the person is who will get lost. If the machine to check, then wait for others to machine error. Otherwise, people win.)