It means use the merge sort but implement it in a clean, understandable way. https://rosettacode.org/wiki/Sorting_algorithms/Merge_sort https://rosettacode.org

It means use the merge sort but implement it in a clean, understandable way. https://rosettacode.org/wiki/Sorting_algorithms/Merge_sort https://rosettacode.org/wiki/Sorting_algorithms/Merge_sort - which ones of these do you consider objectively "clean and understandable"? Why should any of them (Prolog, Mercury, J, Common-Lisp, etc) be considered "not understandable" instead of "not familiar to the reader"?