Kushal Vijay (SDE II, Microsoft)
Most students struggle with DSA and feel intimidated. This sheet, created by Kushal Vijay—Software Engineer II at Microsoft—covers 20 essential patterns in a strategic order to help you master all topics confidently and overcome the fear of DSA.
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There is no PDF here, and you do not need one. All 180 problems are listed in full on this page, free and without an account — and unlike a PDF the list remembers what you have ticked off, so you are not re-reading a static file to work out where you stopped. Use your browser's print view if you want it on paper.
Tick a problem on this page and it stays ticked. Progress saves in your browser straight away with no account, and the counts update per section so you can see which parts of 20 Essential DSA Patterns by Kushal Vijay you have actually covered. Signing in with Google syncs it across devices.
180, grouped into 22 topics. Every one is listed on this page and tickable as you solve it.
At roughly 25 minutes a problem — reading it, solving it and writing the approach down — 180 problems is about 75 hours, or 8 weeks at ten hours a week. Treat that as a planning figure rather than a promise; the first pass through an unfamiliar topic is always slower.
Yes, completely, and no account is needed. There is no paid tier and nothing is held back — the sheet itself is by Kushal Vijay (SDE II, Microsoft), and this is a free tracker for it.
Finish one. Sheets overlap heavily, so working several in parallel mostly means re-solving the same problems while never completing a full topic sweep. If you are not sure this is the right one for the time you have, the sheet comparison page puts the options side by side with hour estimates.