for double

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)

signed main()
{
    fastio;

    int n;
    cin >> n;
    double a[n + 5];
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }

    cout << fixed << setprecision(2) <<
}