# CS++ Data Structures — Build them yourself, in Java

> Build them yourself, in Java (iPhone/iPad app by Kevin Hare.)

- Source: https://appshunter.io/ios/app/cs-plus-plus-data-structures/id6801367071 (this page in markdown: same URL + `.md`)
- Developer: [Kevin Hare](https://appshunter.io/developer/1343264116)
- Category: Education, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 34 MB
- Languages: American English
- Released: 2026-08-27
- Data updated: 2026-09-11
- User reviews in markdown: https://appshunter.io/ios/app/cs-plus-plus-data-structures/id6801367071/reviews.md

## What is CS++ Data Structures?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Full DSA Course | $9.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-27

No release notes.

## More apps by Kevin Hare

- [CS++ Java IDE](https://appshunter.io/ios/app/cs-plus-plus-java-ide/id6763799792)
- [CS++ AP CSA](https://appshunter.io/ios/app/cs-plus-plus-ap-csa/id6763950108)
- [CS++ AP CSP](https://appshunter.io/ios/app/cs-plus-plus-ap-csp/id6763950898)
- [Debugging: Inside the Machine](https://appshunter.io/ios/app/debugging-inside-the-machine/id6764385144)
- [CS++ HCI Design](https://appshunter.io/ios/app/cs-plus-plus-hci-design/id6794191854)
- [CS++ Web Design](https://appshunter.io/ios/app/cs-plus-plus-web-design/id6794192705)

All apps by Kevin Hare: https://appshunter.io/developer/1343264116

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-11.*