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Big-O Cheatsheet

bigocheatsheet.com Learn to Code Website

Big-O Cheatsheet summarizes algorithm complexity notation and offers a downloadable PDF.

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About Big-O Cheatsheet

Big-O Cheat Sheet is a web reference that lists the space and time Big-O complexities of common algorithms used in computer science. It presents complexity tables for common data structures, including average and worst case access, search, insertion and deletion operations, and for array sorting algorithms, including best, average and worst case time complexity plus worst case space complexity. A chart rates complexity growth from excellent to horrible.

The page offers a downloadable PDF version. Complexity values are shown for the listed data structures and sorting algorithms only, and no pricing, licence or account information is stated on the homepage.

Key features

  • Complexity tables for common data structures such as arrays, trees and hash tables
  • Best, average and worst case time complexity for array sorting algorithms
  • Worst case space complexity for sorting algorithms
  • Big-O complexity chart rating growth rates from excellent to horrible
  • Downloadable PDF version of the cheat sheet
  • Contributors can suggest changes through an edit link
Best for: Developers and computer science students who want a quick reference on algorithm and data structure complexities, particularly when preparing for technical interviews.
Good for
  • Collects data structure operations and sorting algorithms in one page
  • Separates average, worst case and best case complexity values
  • Offers a downloadable PDF for offline reference
Watch out for
  • Confined to the data structures and sorting algorithms listed in its tables

Big-O Cheatsheet at a glance

Type
Website
Pricing
Not confirmed. Check the site
Platforms
Web
Open source
Not stated
Last checked
Oct 5, 2026 · Online when checked
Listed
Oct 5, 2026

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Big-O Cheatsheet FAQ

What does the page cover?
It lists the space and time Big-O complexities of common algorithms, covering common data structure operations and array sorting algorithms.
Can I download the cheat sheet?
Yes. The page includes a Download PDF link.
Is a printed poster available?
The page links to an official Big-O Cheat Sheet poster.
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Listing maintained by Chris McClure and the WebIndexly editors · Updated Oct 11, 2026 · How we rank