for (int room = 0, roomCount = rooms.Count; room < roomCount; room++)
{
rooms[room] = new Room();
}

room can be replaced by pos (or anything more meaningful); anyway: anything not like this as a code will not go live for me... Besides this point, when I had to manage core reviews, I dit it with the whole team so anybody could have seen and emphasis on different things and not only what I wanted to pinpoint. One point missing, is that code reviews in 2021 aren't the same as those done in the 1990: now we have tools like R# Shart (no publicity intended) which are removing a lot of "discrepancies" (bugs), automating test tools, and so on. So now, code reviews are more about code's readability and maintenance. Because of these (hey folks, dont forget you're using Intellisense which types most of the code for you!), so definitively no excuse to have readable code.

for (int room = 0, roomCount = rooms.Count; room < roomCount; room++)
{
rooms[room] = new Room();
}

Il just refuse anything else than something like this, my point of view

If you update thousands of records because of one... Chances are that if I'm your project manager I won't be happy... But your surely have found a solution on that issue ;) Saying this, but I know how it is... Regards, Eric

Where I'm actually living, during one of my too often trip I had the opportunity to look at an advertise, which explained a bit how is determined the price of a plane-ticket. You'll be surprised to learn than more of the half is only taxes (either from departure airport/country or from destination airport/country). So for the question, as far as the strictly speaking cost of the plane is the same, their shouldn't be any difference. By saying this, their could be in fact a difference: taxes from the departure airport of your travel when you're buying a go and back plane ticket. I saw cases, when you go back first (not a mistake), taxes are less on the overall flight and the overall plane ticket is less expensive ; but local regulations don't allow you very often to do such a trip ;) Regards, Eric