How many different AVL trees can result from inserting permutations of 1, 2, 3, and 4 into an initially empty tree? Note: Notice that in groups of 3, the middle node always rebalances to the top.
Added by Lisa H.
Step 1
Inserting the first element (1) will result in only one AVL tree, which is just a root node with value 1. Show more…
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