10432 - Polygon Inside A Circle

All about problems in Volume 104. If there is a thread about your problem, please use it. If not, create one with its number in the subject.

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p!ter
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Post by p!ter » Wed Jan 26, 2005 6:24 pm

Hi sohel
I rebuild my code and got ACC... :D :D :D
Thanx!!!!!!!!
It is not mantioned that radius can be real :evil:

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J&Jewel
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Post by J&Jewel » Sun Jun 26, 2005 12:39 pm

My program is ok for sample input output
can anybody give me some I/O...plz..
or any hints..

Code: Select all

#define PI acos(0)
int main()
{
	double r,angle,area;
	int n;
	//freopen("F:\\10432.txt","r",stdin);
	while(scanf("%lf%d",&r,&n)==2)
	{
		angle=180-((double)180*(n-2)/n);
		area=sin(PI/180*angle)*r*r*n/2.0;
		printf("%.3lf\n",2*area);
	}
	return 0;
}
I hate Wrong Answer!

challenger
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10432 - WA grrr

Post by challenger » Tue Feb 28, 2006 2:12 am

I am always getting Wrong Answer (WA) ! Why is that?
Can anyone find the bug in my code? I would really appreciate that.

Code: Select all

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

#define pi 2.*acos(0)

main()
{
	float r,n,b,h,ang,area;

	while( scanf("%f %f",&r,&n)==2 )
	{
		ang=(2.*pi)/n;
		b=r*sin(ang);
		h=sqrt(r*r-b*b/4.);
		area=n*(b*h/2.);
		printf("%.3f\n",area);
	}
}

Darko
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Location: Calgary, Canada

Post by Darko » Tue Feb 28, 2006 2:52 am

I think you should use doubles. And there is a simple formula for the area.

I don't even think your formula should work - b should be 2.0*r*sin(ang/2.0), draw a picture.

Try

1 4
0.7071 4

you should get
2.000
1.000

Darko

challenger
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Post by challenger » Tue Feb 28, 2006 2:54 pm

Ok! I fixed the double thing and the base and height formulads :)

[removed]

Double in ANSII is %f but I had to change it to %lf ... that was my error.
Last edited by challenger on Sun Mar 05, 2006 6:39 pm, edited 1 time in total.

Darko
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Location: Calgary, Canada

Post by Darko » Tue Feb 28, 2006 5:37 pm

Heh, I'm glad for you, but you shouldn't be posting accepted code, please remove it.

Darko

gvs
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grrr...

Post by gvs » Sat May 13, 2006 9:55 am

does anybody know why this occurs ?
I tried my code on both Windows, and Ubuntu, but there was no difference... I used acos(0.0) for pi... and kept getting WA.
But when i used acos(-1.0), i finally got AC...

god knows why ....
this is the 3rd such problem I've faced in the last 5... n it's drivin me crazy...

makes coding much more difficult and infuriating...
maKe wHat yoU waNt...... you'll succeed

Ankur Jaiswal
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Post by Ankur Jaiswal » Sun May 21, 2006 10:12 am

may be the WA's came bcoz u took the value of PI from any other source(may be u have searched google or seen math.h).
In general always use PI=2*acos(0.0). you wont get precision errors then.

kolpobilashi
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Location: Dhaka,Bangladesh
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10432 output limit xceed!!!

Post by kolpobilashi » Sat Jun 03, 2006 6:30 am

[code]

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

int main()
{
int r,n;
while(scanf("%d %d",&r,&n)!=EOF)
{
double s,f,PI;
PI=2*acos(0.0);
f=sin(2*PI/(double)n);
s=(double)(.5*r*r*f*n);
printf("%.3lf\n",s);
}
return 0;
}

:cry: [/code]
Sanjana

Moha
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Post by Moha » Sat Jun 03, 2006 8:06 am

the problem statements dosn't say that 'r' is an integer number . read it as a double and try again.

kolpobilashi
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Post by kolpobilashi » Sat Jun 03, 2006 11:31 am

thanx a lottt!!! :D
Acc now :)
Sanjana

deena sultana
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10432, WA, help me!

Post by deena sultana » Sun Jun 25, 2006 7:14 pm

Hi, friends, again i need your help.
i got WA for 10432. but i dont understand why. :(
would you plz help me?

Code: Select all

Removed After AC;
Last edited by deena sultana on Sun Jun 25, 2006 7:33 pm, edited 1 time in total.

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emotional blind
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Post by emotional blind » Sun Jun 25, 2006 7:22 pm

Unfortunately your formula is Wrong
If u use sin instead of asine it should be right


If you get ACCEPTED
Dont be lazy to remove your code please
otherwise it spoils the problem

Best wishes

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emotional blind
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Post by emotional blind » Sun Jun 25, 2006 7:23 pm

Unfortunately your formula is Wrong
If u use sin instead of asine it should be right


If you get ACCEPTED
Dont be lazy to remove your code please
otherwise it spoils the problem

Best wishes

deena sultana
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Posts: 36
Joined: Mon Jun 19, 2006 5:43 pm
Location: Bangladesh
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Post by deena sultana » Sun Jun 25, 2006 7:36 pm

emotional blind

u r sooooooooo nice.
Thank u very much.
i get ac now. :D

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