منابع مشابه
The universal ancestor.
A genetic annealing model for the universal ancestor of all extant life is presented; the name of the model derives from its resemblance to physical annealing. The scenario pictured starts when "genetic temperatures" were very high, cellular entities (progenotes) were very simple, and information processing systems were inaccurate. Initially, both mutation rate and lateral gene transfer levels ...
متن کاملMarked Ancestor Problems
Consider a rooted tree whose nodes can be in two states: marked or unmarked. The marked ancestor problem is to maintain a data structure with the following operations: mark marks node ; unmark removes any marks from node ; firstmarked returns the first marked node on the path from to the root. We show tight upper and lower bounds for the marked ancestor problem. The lower bounds are proved in t...
متن کاملLowest Common Ancestor(LCA)
Before embarking into the technicalities of the different algorithms for LCA, let us first agree on the terminology that we will be using throughout this article. Let there be a rooted tree T(E,V). A node x ∈ T is called an ancestor of a node y ∈ T if the path from the root of T to y goes through x. Also, a node v ∈ T is called to be a common ancestor of x and y if it is an ancestor of both x a...
متن کامل2 Least Common Ancestor
In particular, we are allowed to preprocess the texts in order to be able to answer the query faster. Our preprocessing choice was the use of a single suffix tree, in which all the suffixes of all the texts appear, each suffix ending with a distinct symbol that determines the text in which the suffix appears. In order to answer the query we reduced the problem to range-min queries, which in tur...
متن کاملLeast Common Ancestor Networks
Least Common Ancestor Networks (LCANs) are introduced and shown to be a class of networks that include fat-trees, baseline networks, SW-banyans and the router networks of the TRAC 1.1 and 2.0, and the CM-5. Some LCAN properties are stated and the permutation routing capabilities of an important subclass are analyzed. Simulation results for three permutation classes verify the accuracy of an ite...
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ژورنال
عنوان ژورنال: Oxford Journal of Archaeology
سال: 2010
ISSN: 0262-5253,1468-0092
DOI: 10.1111/j.1468-0092.2010.00350.x