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Data Structures | Graph | Question 4

Last Updated : 28 Jun, 2021

The most efficient algorithm for finding the number of connected components in an undirected graph on n vertices and m edges has time complexity.
(A) $\theta$ (n)
(B) $\theta$ (m)
(C) $\theta$ (m + n)
(D) $\theta$ (mn)
(A) A
(B) B
(C) C
(D) D

Answer: (C)

Explanation: Connected components can be found in O(m + n) using Tarjan’s algorithm. Once we have connected components, we can count them.

Quiz of this Question