有n个人围成一圈，顺序排号从第1个人开始报数（从1到3报数）凡报到3的人退出圈子，最后留下的是原来第几号？利用指针编程实现。-N personal circle, order Arranging reported from a personal number (from 1-3 reported number) Where a report 3 people out of the circle, the last remaining original number? The use of poi