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Time Complexity of Breadth First Search is? (V – number of vertices, E – number of edges)

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Time Complexity of Breadth First Search is? (V – number of vertices, E – number of edges)

(a) O(V + E)

(b) O(V)

(c) O(E)

(d) O(V*E)

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My question is from Breadth First Search topic in division Graph Search of Data Structures & Algorithms II

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Correct answer is (a) O(V + E)

Best explanation: The Breadth First Search explores every node once and every edge once (in worst case), so it’s time complexity is O(V + E).

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