"Math" Joseph Ring question, the last remaining person is the first few people

Title: Joseph Ring question, the last remaining person is the first few people. As a total of 4 people, counting to 2 of the people out, the last person left is the 1th person, return 1.

Reference: http://www.cnblogs.com/EricYang/archive/2009/09/04/1560478.html

int Josephus (int n, int k) {if (n<=0 | | k<1) throw exception (); if (n==1) return 1;//man-made rule, n is 1 o'clock return 1int res=k%2;//only two people, return Back of the person's subscript (calculated from zero) for (int i = 3; I <=n; i++) {res = (res + k)% i;} Return res+ 1;//The last value returned is calculated starting from 1}

"Math" Joseph Ring question, the last remaining person is the first few people