| AVL Trees |
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| • | What
we do is rotate the tree to make it balanced |
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| • | Rotations
are not necessary after every insertion |
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| &
deletion (it is only needed when the height |
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| differs
by more than 1) |
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| – | experiments
indicate that deletions in 78% of the cases |
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| require
no rebalancing |
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| – | and
only 53% of the insertions do not bring the tree out |
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| of
balance |
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