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## Discussion of Problem 1874. Football Goal

1 Wrong
Posted by Fadeev.E.V 2 Jan 2012 04:43
Please tell me why I wrong?

import java.util.*;
import java.math.*;
public class Program {
public static void main (String arqs[]) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt(),b = sc.nextInt();

double x = (a+Math.sqrt(a*a+2*b*b))/2;
double S = (a+x)/2*Math.sqrt(b*b-(x-a)*(x-a));
System.out.printf("%.9f",S);
}
}

Edited by author 02.01.2012 04:44
Re: 1 Wrong
Posted by watashi 9 Jan 2012 01:37
Hi,
Can you please tell me how did you find this formula ?
I have tried many times, but cannot find the solution.
Thanks.
Re: 1 Wrong
Posted by _-Re@l-_ 12 Feb 2012 17:39
Oh, all is very easy. Using derivative, you can find angle between sticks in which area has a maximum value. Just find stationary point of area function.

Edited by author 12.02.2012 17:45
Re: 1 Wrong
Posted by watashi 22 Feb 2012 17:53
Thank you very much.