Kick start Round B 2022 Infinity Area Solution

Problem Link:  https://codingcompetitions.withgoogle.com/kickstart/round/00000000008caa74/0000000000acf079 

Solution in C++: 

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

///**********ALLAH IS ALMIGHTY************///

#include <bits/stdc++.h>

double pi = 2*acos(0.0);

using namespace std;

int main()

{

    long long  t,j=0,r,rr,a,b;

   long double area;

    cin>>t;

    while(t--)

    {

        cin>>r>>a>>b;

        rr=r;

        area=pi*rr*rr;

        while(rr)

        {

            rr=rr*a;

            area+=(pi)*rr*rr;

            rr=rr/b;

            area+=pi*rr*rr;

        }

        printf("Case #%lld: %.6llf\n",++j,area);

    }

    return 0;

}