Abstract
Two upper bounds for the total path length of binary trees are obtained. One is for node-trees, and bounds the internal (or root-to-node) path length; the other is for leaf-trees, and bounds the external (or root-to-leaf) path length. These bounds involve a quantity called the balance, which allows the bounds to adapt from the n log n behavior of a completely balanced tree to the n 2 behavior of a most skewed tree. These bounds are illustrated for the case of Fibonacci trees.
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