Shortest ancestral path. Given a DAG and two vertices v and w, find the shortest ancestral path between v and w. An ancestral path between v and w is a common ancestor x along with a shortest path from v to x and a shortest path from w to x. The shortest ancestral path is the ancestral path whose total length is minimized. Warmup: Find a DAG where the shortest ancestral path goes to a common ancestor x that is not an LCA. Hint: Run BFS twice, once from v and once from w

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Shortest ancestral path. Given a DAG and two vertices v and w, find the shortest
ancestral path between v and w. An ancestral path between v and w is a common ancestor x along with a shortest path from v to x and a shortest path from w to x. The shortest ancestral path is the ancestral path whose total length is minimized. Warmup: Find a DAG where the shortest ancestral path goes to a common ancestor x that is not an LCA. Hint: Run BFS twice, once from v and once from w.

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