CS++ Data Structures
Build them yourself, in Java
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
CS++ Data Structures & Algorithms is the Java course that comes after AP CSA — twelve units in which you build every structure yourself instead of calling a library. Fully offline, with a real Java runtime built in.
WHAT YOU GET
• 12 units, 81 lessons — from the Java behind a data structure through dynamic programming
• 97 inline Java coding challenges that compile and run on your device, with test cases and instant feedback
• 159 multiple-choice checks and 79 Parsons puzzles woven into the lessons
• Efficiency gates: challenges that fail a correct answer for being too slow, so Big-O stops being a vocabulary word and starts being a constraint
• Progress saved on-device, persistent across sessions
• Unit 1 is free; the full course unlocks for $9.99 (one-time)
THE 12 UNITS
1. The Java Behind a Data Structure — interfaces, generics, iterators, and the equality contract
2. Cost as a Budget, with Union-Find
3. Growable Arrays & the Range Toolkit
4. Linked Lists & the Node Mindset
5. Stacks, Queues & the Monotonic Trick
6. Writing Recursion & Backtracking
7. Sorting, Search Templates & Greedy
8. Hash Maps: O(1), and How It Breaks
9. Trees, Binary Search Trees & Tries
10. Heaps & Priority Queues
11. Graphs
12. Dynamic Programming & the Capstone
THINGS YOU BUILD, THEN USE
The course composes. The union-find you write in Unit 2 powers Kruskal in Unit 11. The heap you write in Unit 10 powers Dijkstra. By the capstone you are not calling a library — you are calling yourself.
WHY OFFLINE
The bundled Java runtime executes your code locally on the device. All lesson content ships with the app: no streaming, no fetching, no waiting. Use it on a plane, on a school network that blocks everything, or anywhere with no signal.
WHY CS++
We teach computer science online at csplusplus.com to teachers and students across the United States. This course is packaged for high school but aligned to a college CS2 / data-structures syllabus, so the work transfers.
PRIVACY
No account creation. No sign-in. No analytics or tracking. All progress lives in app storage on your device. No data is sent to our servers.
THE PURCHASE
The free tier is all of Unit 1 — seven full lessons, enough to judge the format and the on-device Java runner before you pay anything. The full unlock is a one-time $9.99 purchase for all 12 units, forever, with no subscription.
WANT A FREE-FORM EDITOR TOO?
For an open Java environment with multi-file projects, Scanner input, and a templates menu, see our companion app CS++ Java IDE — same Java runtime, just an editor instead of a course.
Built by Yellow Dart Publishing.
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The developer, Kevin Hare, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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Information
- Seller
- Kevin P Hare LLC
- Size
- 35.2 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Unlock Full DSA Course $9.99
- Copyright
- © 2026 Yellow Dart Publishing