If two ID of birds are the same number the smaller ID wins. So the array m must be initialized in descending order.

Of course, you can write

list(range(4, -1, -1))

or

list(reversed(range(5)))

If there were many kinds of birds I would have written so. But for this specific case [4, 3, 2, 1, 0] is easier to read.

I just avoid premature generalization.