August 2017
Intermediate to advanced
222 pages
5h 3m
English
Content preview from A Common-Sense Guide to Data Structures and Algorithms
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Worst-Case Scenario
The worst-case scenario for Quicksort is one in which the pivot always ends up on one side of the subarray instead of the middle. This can happen in several cases, including where the array is in perfect ascending or descending order. The visualization for this process is shown.
While, in this case, each partition only involves one swap, we lose out because of the many comparisons. In the first example, when the pivot always ended up towards the middle, each partition after the first one was conducted on relatively small subarrays (the largest subarray had a size of 4). In this example, however, the first five partitions take ...
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