约瑟夫算法：n个人围成一圈，每人有一个各不相同的编号，选择一个人作为起点，然后顺时针从1到k数数，每数到k的人退出圈子，圈子缩小，然后从下一个人继续从1到k数数，重复上面过程。求最后推出圈子的那个人原来的编号。

　　思路：按照上面的算法让人退出圈子，直到有n-1个人推出圈子，然后得到最后一个退出圈子的人的编号。

　　程序：坐成一圈的人的编号不需要按序排列-Joseph algorithm: n individuals in a circle, each with a different number, choose a person as a starting point, and then clockwise to count from 1 to k, each count to exit the circle k, narrow circle, and then from the next person to continue to count from 1 to k, repeat the above process. And the man finally launched circle of the original number.

Idea: according to the above algorithm to exit the circle, until there is n- 1 personal circle, and then get the final out of the number people.

The serial number of procedures: sit in a circle of people do not need to be arranged in sequence