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. Shellsort, also known as Shell sort or Shell's method, is an in-place comparison sort. It can be understood as either a generalization of sorting by exchange (bubble sort) or sorting by insertion (insertion sort). [3] Shell sort is an algorithm that first sorts the elements far apart from each other and successively reduces the interval between the elements to be compared. In this tutorial, you will understand the working of shell sort with working code in C, C++, Java, and Python.
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