十发子弹打中90环的解法，很多公司都采用这道题作为笔试题，在此提供了递归算法，大家可以共同研究一下-10 bullets hit the 90 Central solution, many companies have adopted Jesus as the T test, in a recursive algorithm, we can jointly study

耶稣有13个徒弟，其中有一个徒弟出卖了耶稣。现在将13个人标上号码1~13，并围成一个圆圈，然后1,2,3,1,2,3,1,2,3……的轮着报数，只要报到3的人被删除，如此循环着，最后剩下的那个人的就是叛徒。-Jesus has 13 disciple, and there is a disciple betray Jesus. Now 13 people will be marked with a number 1 ~ 13, and round in a circle, then 1,2,3