题目：​​http://acm.hdu.edu.cn/showproblem.php?pid=1061​​

#include<stdio.h>
 int main()
 {
    int n, m,  unit;
    int a[10][4]={{0,0,0,0},{1,1,1,1},{6,2,4,8},{1,3,9,7},{6,4,6,4},{5,5,5,5},{6,6,6,6},{1,7,9,3},{6,8,4,2},{1,9,1,9} };
    scanf("%d", &m);
    while( m-- )
    {
        scanf("%d", &n);
        unit=n;
        printf("%d\n", a[unit][n%4]);
    }
 }