Submission #967610

---

Source Code Expand

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

double f(int i,long long N,double R){
	if( i <= 0 or i > N ) return 0;
	double y = 1.0 * i / N * (2*R) - R;
	//cout << y << endl;
	double x = sqrt(R*R-y*y);
	return x;
}
void solve(long long R, long long N, long long M){
	map<int,int> C;
	double ans = 0;
	for(int i = 1 ; i < N + M ; i++){
		ans += 2*max(f(i,N,R),f(i-M,N,R));
		//cout << f(i,N) << " " << f(i-M,N) << endl;
	}
	printf("%.10lf\n",ans);
}



int main(){	
	ios::sync_with_stdio(false);
	long long M;
	long long N;
	long long R;
	cin >> R;
	cin >> N;
	cin >> M;
	solve(R, N, M);
	return 0;
}

Submission Info

Judge Result