华为2016研发工程师编程题:删固定位置的数

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        while(in.hasNext()){
            int n = in.nextInt();
            int id = -1;
            if(n<=1){
                break;
            }
             
            int[] A = new int[n];
            int flag = 0;// max 3
            int num = n;
            while(num>=1){
                id++;
                if(id ==n) id = 0;
                if(A[id] == 0){
                    flag++;   
                }
                if(flag == 3){
                    flag = 0;
                    A[id] = -1;
                    num--;
                }
                 
            }
            System.out.println(id);
             
        }
    }
}