说明：  n个人围成一个圈，并将他们从1到n编上号，从号为1的那个人那里开始计数，每次消去第二个人，到最后只留下一个幸存者。
(N individual into a circle, and their number from 1 to n, start counting from the number 1 person, every time elimination, the second to the last to leave only a survivor.)