Shell sort is a sorting algorithm that is a generalization of insertion sort with two observations:
• Insertion sort is e cient if the input is “almost sorted”.
• Insertion sort is typically ine cient because it moves values just one position at a time.
e shell sort is named a er its inventor D.L. Shell in 1959. It is fast, easy to understand and easy to
implement. However, its complexity analysis is more complicated. e idea of shell sort is to arrange the data
sequence in a two-dimensional array and sort the columns of the array. e e ect is that the data sequence ...
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