一个continue害死我拉，贴一下代码吧，过了。

#include <cstdlib>
#include <iostream>
#include <cmath>
#include <stdio.h>
using namespace std;
const double J=pow(10.0,-8.0);
struct point {
double x,y;
}p1[1001],p2[1001],b,e,p[1001];

double dis(point p1,point p2){
return sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y));
}

double multi(point a,point b ,point o ){
return (a.x-o.x)*(b.y-o.y)-(b.x-o.x)*(a.y-o.y);
}

int main(int argc, char *argv[])
{int ncases,i,j,k,n;
 while(scanf("%d",&ncases)!=EOF){
    while(ncases--){
       scanf("%d",&n);
       for(i=0;i<n;i++){
            scanf("%lf%lf%lf%lf",&p1[i].x,&p1[i].y,&p2[i].x,&p2[i].y);
            p[2*i]=p1[i];
            p[2*i+1]=p2[i];
            }
       if(n==1||n==2)
            printf("Yes!\n");
       else {
       bool pp;
       bool yes=0;
       for(i=0;i<2*n;i++){
         for(j=0;j<2*n;j++){
             pp=1;
             b=p[i];
             e=p[j];
             if(dis(b,e)<J){
                pp=0;
                continue;
                }
             for(k=0;k<2*n;k+=2){
                 double x1,x2;
                 x1=multi(p[k],b,e);
                 x2=multi(p[k+1],b,e);
                 if(x1*x2>=J){
                     pp=0;
                     break;
                     }
                 }
             if(pp)
                break;
             }
         if(pp){
            yes=1;
            break;
            }
       }
       if(yes)
          printf("Yes!\n");
       else
         printf("No!\n");
       }
       }
    }
    system("PAUSE");
    return EXIT_SUCCESS;
}