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同问，我这么做也wa了。。。。In Reply To:为什么是WA呢？难道精度有问题？算法是参照佳佳书上的。。。 Posted by:kef at 2006-04-14 00:28:06 > #include<stdio.h>
>
> int xi,yi,xj,yj,x1,y1;
> __int64 cx,cy,area;
>
> int main()
> {
> int t,n,i;
> scanf("%d",&t);
> while(t--) {
> area=0;
> cx=cy=0;
>
> scanf("%d",&n);
> scanf("%d%d",&x1,&y1);
> xi=x1; yi=y1;
>
> for(i=1;i<n;i++) {
> scanf("%d%d",&xj,&yj);
> area+=xi*yj-yi*xj;
> cx+=(xi+xj)*(xi*yj-yi*xj);
> cy+=(yi+yj)*(xi*yj-yi*xj);
> xi=xj; yi=yj;
> }
> area+=xi*y1-yi*x1;
> cx+=(xi+x1)*(xi*y1-yi*x1);
> cy+=(yi+y1)*(xi*y1-yi*x1);
>
> printf("%.2lf %.2lf\n",cx/3.0/area,cy/3.0/area);
> }
> return 0;
> }
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