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
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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

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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Posts: 1334
Joined: Wed Jun 22, 2005 10:58 pm
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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

Code: Select all

cout.precision(5);
cout << fixed;
cout << "Case " << ++CASES << ": " << (float)a << " " << (float)b << endl;
Hope this helps AbyssalGreed
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Posts: 9
Joined: Mon Aug 25, 2014 5:25 am

Re: 10451 - Ancient Village Sports

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
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Posts: 585
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

Code: Select all

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
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Posts: 9
Joined: Mon Aug 25, 2014 5:25 am

Re: 10451 - Ancient Village Sports

thanks for helping 