Submission #4013696

---

Source Code Expand

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

int main(){
  double R; int N,M; cin >> R >> N >> M;
  double length[100001];
  for(int i=0; i<=N; i++){
    length[i]=2*R*sqrt(1-abs(1-2*(double)i/N)*abs(1-2*(double)i/N));
  }
  double result=0;
  for(int i=1; i<=N+M-1; i++){
    if(i<=N&&i-M>=0){
      result+=max(length[i],length[i-M]);
    }else if(i<=N){
      result+=length[i];
    }else if(i-M>=0){
      result+=length[i-M];
    }
  }
  cout << fixed << setprecision(10) << result << endl;
}

Submission Info

Judge Result