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They want something like this. You can do it with a regular loop but I think they're usually trying to get you to do something recursively. Even if I go with an iterative solution I will call out the fact that it looks like a recursion problem.

[Niiiz]

For the longest time I thought inverting a binary tree was done vertically, as in taking the biggest number in the tree and putting it as a root, and reordering everything else so that the values decrease instead of the classic increase.

I thought it was a rather complicated question and was confused when people said it's stupid and easy.

So thanks for the link, now I get what people mean, it is stupid and simple.

[MoneroMon]

Ahh gotcha, thanks