Web Reference: Dec 20, 2025 · It was considered as the first algorithm to break the O (n²) time complexity barrier for sorting. It works by comparing elements that are far apart first, then gradually reducing the gap. Dr. Rob Edwards from San Diego State University summarizes shell sort - a tricky sort to get the complexity right Shellsort was first published in 1959 by Donald Shell making it one of the oldest sorting algorithms. Due to its subquadratic time complexity, simplicity, and O ( 1 ) {\displaystyle {\displaystyle O(1)}} space usage, it was the preferred sorting algorithm among many machines of its time. In the present day, however, Shellsort's title as the fastest...
YouTube Excerpt: Dr. Rob Edwards from San Diego State University summarizes
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