#include<stdio.h>
 int main()
 {
        int *p;
        int n,k,i,j;
        int a[100];
        
        printf("输入班级总人数：");
        scanf("%d",&n);
        
        for(i=0;i<n;i++)
        {
            a[i]=i+1;
        }
        
        k=1;    i=0;     p=a;    j=1;
        for(;;i++,k++,p++)
        {
            if(k==3)
            {
                *p=0;
                k=1;
                j++;
                continue;
            }
            if(*p==0)
            {
                k=k-1;
                continue;
            }
            if(i==n)
            {
                i=-1;
                p=a;
                p--;
                continue;
            }
            if(j==n-1)  break;
        }
        
        p=a;
        while(*p==0)
        {
            p++;
        }
        printf("这个同学的编号是：%d",*p);
        scanf("\n");
    }
我看了N多遍了，实在找不出来，望各位帮帮忙