Submission #6951041

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
double r,k,ans=0;
int n,m,i,j;
double calc(int x){
  if(x<=0||x>=n) return 0;
  k=fabs(r-2*r/n*x);
  return sqrt(r*r-k*k)*2;
}
int main(){
  cin>>r>>n>>m;
  for(i=0;i<=n+m;i++) ans+=max(calc(i),calc(i-m));
  printf("%.8lf\n",ans);
  return 0;
}

Submission Info

Judge Result