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Update Shellsort List.md

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Pete ._. Mango 2019-11-07 20:19:54 +00:00
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Grade 10/Computer Science/ICS4U1/Sorting Methods/Shellsort List.md
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# Shell Sort Handout # Shell Sort Handout
## What is shell sort? ## What is shell sort?
- "Diminishing Increment Sort", better known as comb sort
- Combination of sorting by insertion (insertion sort) and sorting by exchange (bubble sort) - Combination of sorting by insertion (insertion sort) and sorting by exchange (bubble sort)
- Starts off by comparing two elements that are far apart and gradually reduce the gap between them - Starts off by comparing two elements that are far apart and gradually reduce the gap between them
- It works better than regular insertion sort as it moves certain out of place elements into place faster - It works better than regular insertion sort as it moves certain out of place elements into place faster
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} }
``` ```
## Enhanced Shell Sort
- A method to calculate the gap sequence and can decrease the number of comparisons by up to 60%
- Published by Basit Shahzad and Muhammad Tanvir Afzal from the World Academy of Science
- The gap sequence would be h<sub>1</sub> and h<sub>n+1</sub> = 3h<sub>n</sub>+1
- For 100 elements, shell's original gap seuqence will make 170 comparisons but the Enhanced Shell Sort will make 85 comparisons