50个人围成一圈数到三和三的倍数时出圈，问剩下的人是谁？在原来的位置是多少？

package com.test.kaoshi;

import java.util.Iterator;
import java.util.LinkedList;

public class YouXi {
public static int removeNM(int n, int m) {

LinkedList ll = new LinkedList();
for (int i = 0; i < n; i++)

ll.add(new Integer(i + 1));
int removed = -1;
while (ll.size() > 1) {
removed = (removed + m) % ll.size();
ll.remove(removed--);
}
return ((Integer) ll.get(0)).intValue();
}

public static void main(String[] args) {

System.out.println(removeNM(50, 3));
}
}