GATE | GATE MOCK 2017 | Question 47

You are given a graph containing n vertices and m edges and given that the graph doesn’t contain cycle of odd length. Time Complexity of the best known algorithm to find out whether the graph is bipartite or not is ?

(A) O(m+n)
(B) O(1)
(C) O(mn)
(D) O(n2)

Answer: (B)

It is by definition that a graph is bipartite iff it does not contain odd length cycles.
So the answer is O(1).
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