10678 - The Grazing Cow

S.M.ferdous · Post by **S.M.ferdous** » Sun Dec 17, 2006 5:29 pm

Hi everyone

I know its a very easy problem. it seems ellipse to me . I also know the area of ellipse is pi*a*b.

I know 'a' but how could I get 'b'. plz some one help me.

helloneo · Post by **helloneo** » Sun Dec 17, 2006 5:55 pm

This may help.. or not

http://mathworld.wolfram.com/Ellipse.html

S.M.ferdous · Post by **S.M.ferdous** » Sun Dec 17, 2006 6:22 pm

Thanks for your kind reply.

Please give me the logic to solve the problem. I go to the URL, but it is too difficult to search the correct thing which i required.Please discuss your logic.

Jan · Post by **Jan** » Tue Dec 19, 2006 1:11 am

See the image below...

Code: Select all

Spoiler Removed...

L and D are given, you have to find b.

S.M.ferdous · Post by **S.M.ferdous** » Tue Dec 19, 2006 3:43 pm

Thanks jan bhai.

It is very helpful to me.I got accepted

Debashis Maitra · Post by **Debashis Maitra** » Sat Dec 23, 2006 9:22 pm

WHY WA

Code: Select all


NO need to see it again

helloneo · Post by **helloneo** » Sat Dec 23, 2006 9:25 pm

Debashis Maitra wrote:WHY WA
Code: Select all
CUT

In your code, 5 / 2 is 2 not 2.5 because 'int' doesn't keep floating point..

Debashis Maitra · Post by **Debashis Maitra** » Sat Dec 23, 2006 9:36 pm

Thnx helloneo

i am doing too much foolish mistakes

Obaida · Post by **Obaida** » Sat Mar 08, 2008 8:07 am

Some one please help me.... It seems that WA is fixed for me.... I can't do anything....

Code: Select all

Code Removed
}

Jan · Post by **Jan** » Sat Mar 08, 2008 11:14 am

use

Code: Select all

const double pi = 2*aocs(0.0);

Hope it helps.

Obaida · Post by **Obaida** » Sat Mar 08, 2008 11:42 am

Yes...I got Acc.

ahmed · Post by **ahmed** » Mon Apr 06, 2009 4:51 pm

Can anyone please give me any suggestion about why I am getting WA?My code is given below:-

Code: Select all

#include<stdio.h>
#include<math.h>


int main(void)
{
	double a,b,l,d,pi=2*acos(0);
	int n;
	scanf("%d",&n);
	for(;n;n--)
	{

		scanf("%lf%lf",&d,&l);
		a=l/2;
		b=(double)sqrtl((l/2*l/2)-(d/2*d/2));
		printf("%.3lf\n",pi*a*b);
	}
	return 0;
}

Obaida · Post by **Obaida** » Mon Apr 06, 2009 10:08 pm

Replace the following part of your code:

Code: Select all

sqrtl((l/2*l/2)-(d/2*d/2));

with:

Code: Select all

sqrtl(((l/2)*(l/2))-((d/2)*(d/2)))

And remove your code after acc.

ahmed · Post by **ahmed** » Tue Apr 07, 2009 3:01 pm

I have changed according to your suggestion,but I am still getting WA

.Is there any special cases which I haven't considered.Can you give me some inputs to check?
Thanks for helping me out

Obaida · Post by **Obaida** » Wed Apr 08, 2009 7:05 am

remove the double before sqrtl.... hope you will get acc.

OJ Board