Downloads
Every page on this site is free and stays free. These are extras for printing and practice: pay once, download the PDF, no account. Buying one keeps the site running.
Big O cheat sheet
$9
Every complexity on this site on two printable pages: data structures, sorting, searching and graphs.
- Time and space for 9 data structures
- Best, average and worst case for 7 sorting algorithms
- Search and graph algorithms
- Growth classes with real numbers at n = 1,000
Coming soon
Interview workbook
$29
Practice problems grouped by concept, each with hints, a worked solution and its complexity.
- Problems for every data structure and algorithm page
- Hints before solutions
- Code in Python, JavaScript, Go and Rust
Coming soon
Payments are handled by our checkout provider, which emails you the download link. Questions or a problem with a file? Reply to that email.