Arvonta

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long

using namespace std;

void solve(int n) {
	ld ans = 1.0;
	ld p = 1-((ld)1)/n;
	for(int i=0; i<n; i++)
		ans *= p;
	cout << fixed << setprecision(10) << (1-ans) << endl;
}

int main() {
	int t;
	cin >> t;
	while(t--) {
		int n;
		cin >> n;
		solve(n);
	}
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED