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Tango Trees : ウィキペディア英語版
Tango tree
A tango tree is a type of binary search tree proposed by Erik D. Demaine, Dion Harmon, John Iacono, and Mihai Patrascu in 2004.
It is an online binary search tree that achieves an O(\log \log n) competitive ratio relative to the optimal offline binary search tree, while only using O(\log \log n) additional bits of memory per node. This improved upon the previous best known competitive ratio, which was O(\log n).
==Structure==
Tango trees work by partitioning a binary search tree into a set of ''preferred paths'', which are themselves stored in auxiliary trees (so the tango tree is represented as a tree of trees).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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