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• W2959611978 abstract "Let $T$ be a binary search tree. We prove two results about the behavior of the Splay algorithm (Sleator and Tarjan 1985). Our first result is that inserting keys into an empty binary search tree via splaying in the order of either $T$'s preorder or $T$'s postorder takes linear time. Our proof uses the fact that preorders and postorders are pattern-avoiding: i.e. they contain no subsequences that are order-isomorphic to $(2,3,1)$ and $(3,1,2)$, respectively. Pattern-avoidance implies certain constraints on the manner in which items are inserted. We exploit this structure with a simple potential function that counts inserted nodes lying on access paths to uninserted nodes. Our methods can likely be extended to permutations that avoid more general patterns. Second, if $T'$ is any other binary search tree with the same keys as $T$ and $T$ is weight-balanced (Nievergelt and Reingold 1973), then splaying $T$'s preorder sequence or $T$'s postorder sequence starting from $T'$ takes linear time. To prove this, we demonstrate that preorders and postorders of balanced search trees do not contain many large jumps in symmetric order, and exploit this fact by using the finger theorem (Cole et al. 2000). Both of our results provide further evidence in favor of the elusive dynamic optimality conjecture." @default.
• W2959611978 created "2019-07-23" @default.
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• W2959611978 date "2019-07-15" @default.
• W2959611978 modified "2023-09-27" @default.
• W2959611978 title "Splaying Preorders and Postorders" @default.
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