xxx定律快要忘了

代码：

#include <stdio.h>
#include <string.h>
#define M 3000005
int a[M];
bool vis[M];
int temp[M];
int main()
{
    int n;
    while(scanf("%d", &n), n){
        int i, j;
        for(i = 0; i < n; i ++){
            scanf("%d", &a[i]);
        }
        memset(vis, 0, sizeof(vis));
        for(i = 0; i < n; i ++){
            if(vis[a[i]]) continue;
            int tem = a[i];
            while(tem != 1){
                if(tem%2 == 0) tem /=2;
                else tem = (tem*3+1)/2;
                if(tem < 1001)
                vis[tem] = 1;
            }
        }
        for(i = n-1, j = 0; i >= 0; i --){
            if(vis[a[i]] == 0) temp[j++] = a[i];
        }
        printf("%d", temp[0]);
        for(i = 1; i < j; i ++) printf(" %d", temp[i]);
        printf("\n");
    }
}