> #include<stdio.h>
> #include<math.h>
> #define pi 3.141592653589793
> int main()
> {
>     double x,y,xo,yo,a,b,l=0;
> 	int n,i,r;
> 	scanf("%d%d",&n,&r);
> 	scanf("%lf%lf",&xo,&yo);
>     x=(a=xo);
> 	y=(b=yo);
>     for(i=1;i<n;i++)
> 	{
>         scanf("%lf%lf",&xo,&yo);
>         l+=sqrt((xo-x)*(xo-x)+(yo-y)*(yo-y));
>         x=xo;
>         y=yo;
>     }
>     l+=sqrt((xo-a)*(xo-a)+(yo-b)*(yo-b));
>     l+=2.0*pi*(double)r;
>     printf("%.2lf\n",l);
>     return 0;
> }

• Re:苍天啊!什么问题呀?! (10) labor 2008-10-10 18:33:49
  • Re:苍天啊!什么问题呀?! (29) HG 2009-05-15 14:44:58