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Problem : What is the best case efficiency for insertion sort?

The best case efficiency is O(n). It occurs when the data is in sorted order. After making one pass through the data and making no insertions, insertion sort exits.

Problem : What is the worst case efficiency of insertion sort? When does it occur?

The worst case efficiency is O(n2). The worst case occurs when the data is in reverse order.

Problem : Show the steps in sorting the following list using insertion sort: (4, 6, 2, 3, 9).

(4, 6, 2, 3, 9). (2, 4, 6, 3, 9). (2, 3, 4, 6, 9).

Problem : What kind of data structure might make insertion sort particularly inefficient?

A data structure for which shifting data is not efficient.
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