What is the best case time complexity of insertion sort? Please select the tightest Big-O bound of those listed below. Group of answer choices O(n) O(nlogn) O(n2) O(2n)
Question
What is the best case time complexity of insertion sort? Please select the tightest Big-O bound of those listed below. Group of answer choices
O(n)
O(nlogn)
O(n2)
O(2n)
Solution
The best case time complexity of insertion sort is O(n).
This occurs when the input array is already sorted. In this case, the algorithm only needs to go through the array once to check that everything is in order, and no swaps or shifts are necessary.
Therefore, the correct answer is O(n).
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