A Simple Solution to the Level-Ancestor Problem

03/04/2019

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by   Gaurav Menghani, et al.

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A Level Ancestory query LA(u, d) asks for the the ancestor of the node u at a depth d. We present a simple solution, which pre-processes the tree in O(n) time with O(n) extra space, and answers the queries in O(n) time. Though other optimal algorithms exist, this is a simple enough solution that could be taught and implemented easily.