here is my code, although its giving correct answers for my test cases, however, I am getting wa’s.
please help.
#include <bits/stdc++.h>
using namespace std;
#define EPS 0.00001
#define PI 3.1415926535
bool dis (int radii[],int n, int f, double r )
{
for(int i=0; i<n; i++)
{
double area = pow(radii[i], 2), temp = r*r;
while( area >= temp)
{
area -= temp; f–;
}
if( f<=0 )
return true;
}
return false;
}
int main()
{
int t;
cin>>t;
while(t–)
{
cout<<fixed<<setprecision(4);
int n, f;
scanf("%d %d", &n , &f);
double res=0;
int radii[n];
for(int i=0; i<n; i++)
scanf("%d", &radii[i]);
sort(radii, radii+n);
if( n >= f+1 )
{
res = PI*radii[n-f-1]*radii[n-f-1];
cout<<res<<endl; continue;
}
double left =0, right = radii[0];
double mid;
while ( (right-left) >= EPS)
{
mid = left +(right -left)/2;
if( dis(radii, n, f+1, mid))
left = mid;
else
right =mid;
}
res = PI*pow(mid, 2);
cout<<res<<endl;
}
return 0;
}
