If I have a sorted array of size $n$, can I build a Red Black tree out of it in $O(n)$ time in a different algorithm rather than splitting the tree in half every time or the straightforward way that was mentioned in one of the answers?
closed as unclear what you're asking by D.W.♦, David Richerby, Juho, Wandering Logic, Joe Jun 3 '14 at 17:22
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This can be done in a very straightforward way: Just build an almost complete tree and make the nodes on the lowest level red.