## 10451 - Ancient Village Sports

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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deena sultana
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Posts: 36
Joined: Mon Jun 19, 2006 5:43 pm
Location: Bangladesh
Contact:

### THANKS

Sohel,
So kind of u.
THANK U SO MUCH. I get AC now .
take care n keep well, ok?

ankit.arora
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Posts: 11
Joined: Tue May 22, 2007 10:09 pm
Location: India
My code gives WA...... Please help

Code: Select all

``````#include<iostream>
#include<cmath>
using namespace std;

int main()
{
double n,ang,area,r,r2,rim,areaspec,areaoffi,d1;
unsigned long long ar;
int count=0;

while(cin>>n>>area)
{
if(n<3)
break;

count++;

ang=((2*acos(0.0))/n);
r=sqrt((area/(n*cos(ang)*sin(ang))));

r2=r*cos(ang);

areaspec=((2*acos(0.0)*r*r)-area);
areaoffi=(area-(2*acos(0.0)*r2*r2));

ar=(unsigned long long)(areaspec*100000);
d1=(areaspec*100000)-ar;
if(d1>0.5 ||(d1==0.5 && (unsigned long long)ar%2!=0))
ar++;
cout<<(double)ar/100000<<" ";

ar=(unsigned long long)(areaoffi*100000);
d1=(areaoffi*100000)-ar;
if(d1>0.5 ||(d1==0.5 && (unsigned long long)ar%2!=0))
ar++;
cout<<(double)ar/100000<<"\n";

}
} ``````

Jan
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Joined: Wed Jun 22, 2005 10:58 pm
Location: Dhaka, Bangladesh
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Forgot to print caseno?
Ami ekhono shopno dekhi...
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abhineet.bansal
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Posts: 2
Joined: Fri Jul 20, 2007 3:07 pm

### Re: 10451

Someone please look at my code and tell me why i get WA....
i have tried a lot....

Code: Select all

``````// Ancient Village Sports 10451

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int ncase=0;
int n;
while(cin>>n)
{
ncase++;
long double area;
if(n<3) break;
cin>>area;
long double r = sqrt((2.0*area/(long double)n)/sin(4.0*acos(0.0)/(long double)n));
long double ri = r*cos(2.0*acos(0.0)/(long double)n);
r = (2.0*acos(0.0)*r*r) - area;
ri = area - (2.0*acos(0.0)*ri*ri);
r = 100000.0*r;
unsigned long long t = (unsigned long long)r;
if(((r-(long double)t)>0.5)||((r-(long double)t)==0.5 && t%2!=0))
t++;
r = (long double)t/100000.0;
ri = 100000.0*ri;
t = (unsigned long long)ri;
if(((ri-(long double)t)>0.5)||((ri-(long double)t)==0.5 && t%2!=0))
t++;
ri = (long double)t/100000.0;
cout<<"Case "<<ncase<<": "<<r<<" "<<ri<<endl;
}
return 0;
}

``````
Thanx a lot...

Hikari9
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Posts: 20
Joined: Tue Jan 22, 2013 4:39 pm

### Re: 10451 - Ancient Village Sports

This is a precision-error prone problem. I had to tweak a lot in my code to get Accepted.
Well, after a lot of WAs, I found out the precision of the judge for this problem.

1. Read and compute values as doubles
2. Print answer as a float
3. Don't use epsilons

There are many formulas for this problem, all of which work. However, you may get trapped in the precision error so heed this advice.

Just change

Code: Select all

``printf( "Case %d: %.5lf %.5lf\n", ++CASES, a, b );``
into

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``printf( "Case %d: %.5f %.5f\n", ++CASES, a, b );``
or maybe explicitly cast your answer as float

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``````cout.precision(5);
cout << fixed;
cout << "Case " << ++CASES << ": " << (float)a << " " << (float)b << endl;``````
Hope this helps

AbyssalGreed
New poster
Posts: 9
Joined: Mon Aug 25, 2014 5:25 am

### Re: 10451 - Ancient Village Sports

please help me with my code.
I don't know why i'm always getting a WA..
please help

import java.util.*;
import java.math.*;
import java.io.*;
import java.text.*;

class Main
{
public static void main(String args[])throws Exception
{
Code Remove after getting AC in uva
}
}
Last edited by AbyssalGreed on Mon Sep 01, 2014 9:31 am, edited 1 time in total.

lighted
Guru
Posts: 587
Joined: Wed Jun 11, 2014 9:56 pm
Location: Kyrgyzstan, Bishkek

### Re: 10451 - Ancient Village Sports

Don't read from file. Read from standart input

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``Scanner sc = new Scanner(System.in);``
Be careful with integer division. You must convert long to double. Change lines

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``````double Spectator = (2*PI*c)/(b*(Math.sin(Math.toRadians((double)360/b))));
double Official = (c*PI)/(b*(Math.tan(Math.toRadians((double)180/b))));
``````
Or

Code: Select all

``````double Spectator = (2*PI*c)/(b*(Math.sin(Math.toRadians(360.0/b))));
double Official = (c*PI)/(b*(Math.tan(Math.toRadians(180.0/b))));
``````
Don't forget to remove your code after getting accepted.
A person who sees the good in things has good thoughts. And he who has good thoughts receives pleasure from life... Bediuzzaman

AbyssalGreed
New poster
Posts: 9
Joined: Mon Aug 25, 2014 5:25 am

### Re: 10451 - Ancient Village Sports

thanks for helping