编程辅导 COMP 251 – Midterm Page 9 of 10 Fall 2021

Depth-First Search (DFS) and Edge Classification
4. In DFS of a connected undirected graph G, we get only tree and back edges. No forward or cross edges. Answer as concisely and clearly as possible. Long or unstructured will not receive maximum credit.
(a) (13 points) Show by contradiction that you cannot have a Forward edge.
(b) (13 points) Show by contradiction that you cannot have a Cross edge.

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COMP 251 – Midterm Page 9 of 10 Fall 2021

COMP 251 – Midterm Page 10 of 10 Fall 2021

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