Slime wrote:

> It definitely matters less when you're the only one editing the code, but 
> asserting things like this is still a good habit to get into.

OK, fair enough.

>  - trees.size() is 0 in the first place? This could happen if an empty 
> vector was passed in.

There probably *should* be an assert to check that the vector passed in 
is non-empty...

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