Arvonta

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

typedef long long ll;


int main(){
    
    int t;
    cin >> t;
    for (int i=1; i<=t; ++i){
        int a;
        cin >> a;
        double b = 1;
        for (int j=1; j<=a; ++j){
            b = b*(a-1)/a;
        }
        double answer = (double)1 - b;
        cout << setprecision(10) << answer << "\n";
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED