循环链表josephus问题。设有n个人围圈，现从第s个人开始报数，数到第m个人出列，然后从出列的下一个人从新开始报数，数到第m个人又出列，如此反复，直到所有人出列-Circular list josephus problem. Suppose there are n individuals in a circle, is from the first s individual reported the number of individuals out to the m-number column, and then the next person from the column and start again reported the number of individuals and the number to the m dequeue, and so forth, until Everyone out of the line