Submission #3624300

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVS vector<vector<string>>
#define VVC vector<vector<char>>
typedef long long ll;



int main() {
	double n, m, d;
	cin >> n >> m >> d;
	if (d == 0) {
		cout << fixed << setprecision(15) << 1 / n * (m - 1) << endl;
	}
	else {
		cout << fixed << setprecision(15) << 2 * (n - d) / (n*n)*(m - 1) << endl;
	}
	return 0;
}

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