Submission #6779440

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Source Code Expand

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int (i) = 0; i < (n); i++)

int main(){
  double r, n, m, ans = 0, c1, c2;
  cin >> r >> n >> m;
  for(double i = 1; i < n + m; i++){
    c1 = min(r, r * abs(1 - 2 * i / n));
    c2 = min(r, r * abs(1 - 2 * (i - m) / n));
    c1 = 2 * sqrt(r * r - c1 * c1);
    c2 = 2 * sqrt(r * r - c2 * c2);
    ans += max (c1, c2);
  }
  cout << fixed << setprecision(7) << ans << endl;
}	

Submission Info

Judge Result