Submission #967431

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Source Code Expand

#include <string>
#include <vector>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;
int R, N, M;
double func(int x) {
	if (x < 0 || x > N) return 0.0;
	double z = 2.0 * R / N * x - R;
	return sqrt(1.0 * R * R - z * z) * 2.0;
}
int main() {
	cin >> R >> N >> M;
	double ret = 0.0;
	for (int i = 1; i < N + M; i++) {
		ret += max(func(i), func(i - M));
	}
	cout << fixed << setprecision(15) << ret << endl;
	return 0;
}

Submission Info

Judge Result