Submission #6880588

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

int main(){
  double R, N, M;
  cin >> R >> N >> M;
  
  double ans = 0;
  
  for(int i=1; i<=N+M-1; i++){
    double a = 0;
    double b = 0;
    if(i <= N){
     a = R*R - (abs(N-2*i) * R / N)*(abs(N-2*i) * R / N);
     a = sqrt(a)*2;
    }
    if(i-M >= 0){
     b = R*R - (abs(N-2*(i-M)) * R / N)*(abs(N-2*(i-M)) * R / N);
     b = sqrt(b)*2;
    }
    ans += max(a,b);
  }
  cout << setprecision(25) << ans << endl;
}

Submission Info

Judge Result