Question

what is the best case for insertion sort? choice 1 of 4:when the array is already sorted choice 2 of 4:when the array is already sorted backward choice 3 of 4:when the array is sorted by pairs choice 4 of 4:there are no best case for insertion sort

Answer 1

The straightforward sorting algorithm known as insertion sort generates the final sorted array (or list) one item at a time through comparisons.

How is insertion sort defined?

The straightforward sorting technique known as insertion sort compares each item in turn to create the final sorted array (or list). Comparing it to more sophisticated algorithms like quicksort, heapsort, or merge sort on large lists, it performs significantly worse.

The insertion sort algorithm has an O(n) time complexity in the best-case scenario. Meaning that, when a list is already in the right order, the time required to sort it is inversely related to the number of members in the list.

Insertion sort compares O (n) O(n) O(n) elements and doesn't exchange any elements if the input array is already in sorted order (in the Python code above, the inner loop is never triggered). Thus, insertion sort functions in the best scenario.

Therefore, the correct answer is option 1) when the array is already sorted.

To learn more about insertion sort refer to:

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