The 20-Day Interview Pattern Drill
The AlgoHay drill for coding interviews: read the constraints, name the pattern, and state the complexity out loud, twenty times
The Big O Calculator on this site tells you how many operations a growth class means at a given n. In an interview the question runs the other way: here is n and a time limit, so what complexity must the answer have? The 20-Day Interview Pattern Drill starts there. Part 1 is a five-step method to say out loud: read the constraint (a table of which complexity fits each input size, for compiled and interpreted languages), state the brute force and its count, name the pattern, find the bottleneck, count the space and recursion depth. Part 2 is twenty original problems over four weeks (arrays and hashing, search and ordering, graphs and trees, dynamic programming and search spaces), each with a worksheet and a hint. The answer key gives each approach in one line. Any language. No interview outcome is promised. With your purchase comes a personalised sheet showing what fits at your input size and where your chosen techniques are drilled.
What’s inside
- Read the constraint: which complexity fits each n
- Brute force first, and count it
- Name the pattern
- Find the bottleneck
- Count the space and the recursion
- Twenty original problems over four weeks
- A worksheet and a hint for every problem
- A one-line answer key
- A constraint card, pattern sheet and quickstart
- A personalised sheet: what fits your n, where your techniques are drilled
Run one of the free calculators first and buy from that page, and this sheet is computed from your own figures. Buy from here and the pack still arrives complete — the sheet simply has no numbers of yours to work from yet.
14-day refund, no questions asked. If the pack is not what you needed, email support@graburl.com and we refund you in full — you do not have to justify it or delete the file. Full policy.
$19.00 including any taxes · PDF, 41 pages · instant download, link valid 7 days and 5 downloads.
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