Merge sort in lisp. It's just much less efficient.

Merge sort in lisp If a given list is smaller than two elements then there is no need to sort it, so the merge-sort function just outputs the list as it already is. May 30, 2017 · merge-sort. Sorting and Merging. Aha, there's a clue! You've written insertion sort. Here's what I came up with for mergesort (defun mergesort (lst) "mergesort is the canonical Merge sort on Lisp lists. It does this by calculating how many elements the list has Feb 2, 2013 · You're not splitting in half; you're splitting into one and the rest. lisp This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Which is fine; it works. Merge sort works in a similar way to quick sort - the list is divided into two parts, each part is sorted recursively, and then the two sorted parts are combined together to make a sorted whole. 14. It's just much less efficient. <<mergesort. Some of the difference is probably caused by SBCL’s weaker code generation, but the additional overhead inherent to linked list manipulations (compared to linear accesses in arrays) may also play a part. 5. These functions may destructively modify argument sequences in order to put a sequence into sorted order or to merge two already sorted sequences. Then you sort the rest, and merge the single element into the list. To review, open the file in an editor that reveals hidden Unicode characters. However, with quick sort, the task of comparing items in the list is done during the division into two parts and before the Aug 13, 2012 · Previous work [PDF] on out-of-place array merge sort in C found it useful to switch to conditional move-based merge loop and sorting networks. [Function] sort sequence predicate &key :key stable-sort sequence predicate &key :key The sequence is destructively sorted according to an order determined by the predicate. lisp>>= (defun small (list) (or (null list) (null (cdr list)))) The right-half function returns the right half of a given list. May 5, 2019 · In mergesort this means the functions mergesort and merge respectively. . But you can think of merging a single element into a list as inserting the element into a list. aibndptu reb vwuri xzdu mnfn rungdy mumbbakn vmbkk jkuj upkfv