How to edit an array?

Question

C++ / C#

I have opponents that spawn on the level all the time. And each enemy after spawn tells the script a link to it.
I don't want to render every frame like this:

GameObject[] array = GameObject.FindGameObjectsWithTag("Enemy");

(While optimizing so to speak)
Now the question is:
How do I add to the GameObject array when the enemy spawns. And at his death to remove from there.

Answer 1

Get a List in the class where you spawn (spawn manager). Do list.Add(newEnemy). the code needs to be removed call list.Remove(deadEnemy)

Answer 2

It's not clear what the question is ... But I'll say right away - it's better to use List (at least) - it's easier with deletions and additions.