Find the shortest ancestral path between v and w given a DAG and two vertices, v and w. A common ancestor x, the shortest route from v to x, and the shortest route from w to x make up an ancestral path between v and w. The ancestral path whose overall length is minimised is the shortest ancestral path. Find a DAG where a common ancestor x is reached via the shortest ancestral path that does not lead to an LCA. Run BFS twice, from both v and w, as a hint.
Find the shortest ancestral path between v and w given a DAG and two vertices, v and w. A common ancestor x, the shortest route from v to x, and the shortest route from w to x make up an ancestral path between v and w. The ancestral path whose overall length is minimised is the shortest ancestral path. Find a DAG where a common ancestor x is reached via the shortest ancestral path that does not lead to an LCA. Run BFS twice, from both v and w, as a hint.
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
Section: Chapter Questions
Problem 1PE
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Find the shortest ancestral path between v and w given a DAG and two vertices, v and w. A common ancestor x, the shortest route from v to x, and the shortest route from w to x make up an ancestral path between v and w. The ancestral path whose overall length is minimised is the shortest ancestral path. Find a DAG where a common ancestor x is reached via the shortest ancestral path that does not lead to an LCA.
Run BFS twice, from both v and w, as a hint.
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