Arvonta

#include <bits/stdc++.h>

#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

using namespace std;
using ll = long long;

const int inf = 1e9;
const ll LLinf = 1e18;

void solve() {
    int n; cin >> n;
    // 1 - (1/n)**n
    double x = ((double)(n - 1))/ ((double)n);
    double minus = 1;
    for (int _ = 0; _ < n; ++_) {
        minus *= x;
    }
    cout << fixed << setprecision(15) << 1 - minus << "\n";
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int tt = 1;
    cin >> tt;
    while (tt--) {
        solve();
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED