Problem 1 Prove or disprove the following statements: (a) Let G (V, E) be a directed graph. For any uv E E, if some run of Depth-First-Search (DFS) on G results in v.f>u.f, then uv must be on a cycle. = (b) Consider any run of DFS on a directed graph G = (V, E). For any edge uv E E, if there is a path from v to u in G, then uv cannot be a cross edge.

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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Graph algorithms question - please answer both parts and prove or disprove them. 

Problem 1
Prove or disprove the following statements:
(a) Let G = (V, E) be a directed graph. For any uv € E, if some run of Depth-First-Search
(DFS) on G results in v.f> u.f, then uv must be on a cycle.
=
(b) Consider any run of DFS on a directed graph G (V, E). For any edge uv € E, if there is a
path from v to u in G, then uv cannot be a cross edge.
Transcribed Image Text:Problem 1 Prove or disprove the following statements: (a) Let G = (V, E) be a directed graph. For any uv € E, if some run of Depth-First-Search (DFS) on G results in v.f> u.f, then uv must be on a cycle. = (b) Consider any run of DFS on a directed graph G (V, E). For any edge uv € E, if there is a path from v to u in G, then uv cannot be a cross edge.
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