Guide to Competitive Programming by Antti Laaksonen

Author:Antti Laaksonen
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

Since we know that a node always has less than n ancestors, it suffices to calculate values for each node and the preprocessing takes time. After this, any value of can be calculated in time by representing k as a sum where each term is a power of two.

10.2.2 Subtrees and Paths

A tree traversal array contains the nodes of a rooted tree in the order in which a depth-first search from the root node visits them. For example, Fig. 10.13 shows a tree and the corresponding tree traversal array.

Fig. 10.13A tree and its tree traversal array

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