CSES (Antti Laaksonen)
The CSES Problem Set is a comprehensive collection of algorithmic challenges designed to enhance your programming skills. With over 400 problems spanning topics like Introductory Problems, Sorting and Searching, Dynamic Programming, and Graph Algorithms, it offers a structured pathway for learning and mastering algorithms. Ideal for preparing for coding interviews and competitions, this problem set is a valuable resource for both beginners and seasoned programmers.
Also known as CSES Sheet.
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There is no PDF here, and you do not need one. All 400 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.
Yes — same sheet, different name. It is also known as CSES Sheet. Whichever name you searched for, this is the tracker for it.
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 CSES Problem Set you have actually covered. Signing in with Google syncs it across devices.
400, grouped into 18 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 — 400 problems is about 167 hours, or 17 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 CSES (Antti Laaksonen), 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.