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)
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.
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