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GATE | Gate IT 2007 | Question 24
A depth-first search is performed on a directed acyclic graph. Let d[u] denote the time at which vertex u is visited for the first time and f[u] the time at which the dfs call to the vertex u terminates. Which of the following statements is always true for all edges (u, v) in the graph ?
(A)
d[u] < d[v]
(B)
d[u] < f[v]
(C)
f[u] < f[v]
(D)
f[u] > f[v]
Answer
Please comment below if you find anything wrong in the above post
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