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Suppose we perform Depth First Search ( DFS ) on a digraph G = ( V , E ) given by its adjacency list structure

Suppose we perform Depth First Search (DFS) on a digraph G=(V,E)
given by its adjacency list structure and label each node u in V
by d[u]
and f[u]
, indicating the starting and finishing times of DFSvisit(u), as we learned in the course.
Consider an arbitrary pair of distinct vertices u
and v
such that there is a directed path from u
to v
in G
. Then that implies
(If more than one choice is correct, select the red choice.)
Question 20Answer
a.
d[u]f[v]
.
d.
d[u]

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