剑指offer---圆圈中最后剩下的数字

import java.util.ArrayList;public class LastRemaining {    /*    0,1...n-1这Ｎ个数字排成一个圆圈，从从数字０开始每次从这个圆圈里删除第Ｍ个数字．    求这个圈圈里剩下的最后一个数字     */public int lastRemaining (int count,int m) {if(count < 1 || m < 1){return -1;}ArrayList<Integer> cirList=new ArrayList<Integer>();for (int i = 0; i < count; i++) {cirList.add((int)i);}while(cirList.size()>1){deleteCirlist(cirList, m);}return cirList.get(0);}private ArrayList<Integer> deleteCirlist(ArrayList<Integer> list,int m){for (int i = 0; i < list.size(); i++) {if(i==m-1){list.remove(i);return list;}if(i==list.size()-1){i=-1;                m=m-list.size();}}return list;}}