有n个人围成一圈，顺序排号。从第一个人开始报数（从1到3报数），凡报到3的人退出圈子，问最后留下的是原来第几号的那位。-There are n individuals form a circle,order. The beginning of the first reported from a number of individuals (from 1-3 off), who reported 3 out of the circle of people who asked the last re