Sign In

Communications of the ACM

Communications of the ACM

Best sorting algorithm for nearly sorted lists

Straight Insertion Sort, Shellsort, Straight Merge Sort, Quickersort, and Heapsort are compared on nearly sorted lists. The ratio of the minimum number of list elements which must be removed so that the remaining portion of the list is in order to the size of the list is the authors' measure of sortedness. Tests on randomly generated lists of various combinations of list length and small sortedness ratios indicate that Straight Insertion Sort is best for small or very nearly sorted lists and that Quickersort is best otherwise. Cook and Kim also show that a combination of the Straight Insertion Sort and Quickersort with merging yields a sorting method that performs as well as or better than either Straight Insertion Sort or Quickersort on nearly sorted lists.

The full text of this article is premium content


No entries found

Log in to Read the Full Article

Sign In

Sign in using your ACM Web Account username and password to access premium content if you are an ACM member, Communications subscriber or Digital Library subscriber.

Need Access?

Please select one of the options below for access to premium content and features.

Create a Web Account

If you are already an ACM member, Communications subscriber, or Digital Library subscriber, please set up a web account to access premium content on this site.

Join the ACM

Become a member to take full advantage of ACM's outstanding computing information resources, networking opportunities, and other benefits.

Subscribe to Communications of the ACM Magazine

Get full access to 50+ years of CACM content and receive the print version of the magazine monthly.

Purchase the Article

Non-members can purchase this article or a copy of the magazine in which it appears.
Sign In for Full Access
» Forgot Password? » Create an ACM Web Account