妈的，没见过那么恶心的题目。。。
首先题目就错了，1不是质数啊！！！
输出之间居然还有一空行。。。
检查了半天都没查出来，杀人了！！！

懒得改了，用了同学的
#include  < iostream >
#include  < vector >
#include  < string >
#include  < math.h >
#include  < iomanip >
#include  < stdlib.h >
using   namespace  std;

#include " stdio.h "
#include " math.h "
int  p[ 2001 ];

 int  main()
 {
    int n,c,n1;
    int i,j;
    int tol;
    int flag;
    while(scanf("%d%d",&n,&c)!=-1)
    {


        p[1]=1;
        tol=1;
        for(i=2;i<=3000;i++)
        {
            flag=1;
            for(j=2;j<=(int)sqrt((double)i);j++)
            {
                if(i%j==0){flag=0;break;}
            }
            if(flag==0)continue;
            else if(i>n)break;
            else
            {
                tol++;
                p[tol]=i;

            }

        }


        //此时质数的个数是tol,第一个质数是1
        printf("%d %d:",n,c);
        if(tol%2==0&&tol>=c*2)
        {
            for(i=1;i<=c*2;i++)
            {
                j=(tol-c*2)/2;
                printf(" %d",p[j+i]);

            }
            printf("\n\n");
        }

        if(tol%2==0&&tol<c*2)
        {
            for(j=1;j<=tol;j++)
                printf(" %d",p[j]);
            printf("\n\n");
        }

        if(tol%2==1&&tol>=c*2-1)
        {
            for(i=1;i<=c*2-1;i++)
            {
                j=(tol-c*2+1)/2;
                printf(" %d",p[i+j]);
            }
            printf("\n\n");
        }

        if(tol%2==1&&tol<c*2-1)
        {
            for(j=1;j<=tol;j++)
            {
                printf(" %d",p[j]);
            }
            printf("\n\n");
        }



    }
}