OJ Board

Posted: **Thu Feb 28, 2008 8:10 pm**

thanks i got AC.
it was a simple mistake.
& i was fool

Posted: **Mon Apr 07, 2008 10:26 pm**

for prob 10209
3rd eqn: 2x+y+z=(pi/3 - sqrt(3)/4)a^2

: tri.JPG (35.27 KiB) Viewed 3201 times

2x+y+z
= ((1/2) * s * a) - ((1/2) * c * (a/2))
= yellow shade of circle
= ((1/2) * a * (2/3) * pi * a) - (.5 * sqrt(3)*r * (r/2))
= ((1/3) * pi * a^2) - (sqrt(3)/4 r^2)
= ((1/3) * pi - sqrt(3)/4) * a^2

Posted: **Mon Dec 08, 2008 11:54 am**

Please Help..
I got AC in UVa judge, but why i got WA in http://www.programming-challenges.com judge? I don't understand..
I'm sorry posting my AC code here

, but, for me it's still WA

, coz it's WA in programming-challenges, please help..thanks in advance..

Here is my code, for anyone who got AC, please try at http://www.programming-challenges.com and please tell me why i got WA there?

Code: Select all

#include<iostream>
#include<cmath>
#include<iomanip>
#define eps 1e-6
#define pi 2.0*acos(0.0)//3.1415926535897932384626433832795     //you can choose between two these pi value, both AC

using namespace std;

double LSegitiga(double a);

int main()
{
    double a, L1, L2, L3;
    
    cout<<fixed<<showpoint<<setprecision(3);
    while(cin>>a)
    {
        L1 = 4*(a*a - (pi*a*a/6 + LSegitiga(a)));
        L2 = 4*(a*a - (pi*a*a/4 + L1/2));
        L3 = a*a-L1-L2;
    cout<<L3+eps<<" "<<L2+eps<<" "<<L1+eps<<endl;
    }
    return 0;
}

double LSegitiga(double a)
{
    double s=(3*a)/2;
    
    return sqrt(s*(s-a)*(s-a)*(s-a));
}

Posted: **Sat Dec 13, 2008 3:31 pm**

Hi all.

I solved this problem all by myself in 0.110 sec( it was an easy one ).

I checked the problem stats and was surprised 2 find many

ppl with 0.000 sec

timing !!

R there faster methods 4 solving this problem ??
2 b more specific, this problem would require a total of 3 multiplications and 2 additions ( & subtractions ) :

--> Calculate A2 = A*A : 1 multiplication
--> Calculate Stripped_Area = A2 * k1 : 1 multiplication
--> Calculate Dotted_Area = A2 * k2 : 1 multiplication
--> Calculate Rest = A2 - ( Dotted_Area + Stripped_Area ) : 2 Additions

So, r there faster methods 4 floating point calculations ?? ( 'cuz i don't think this can b solved with any less no. of operations

)