Free to read · 22 interview patterns

Build a memory palace for the patterns interviews keep asking.

Every problem, solution, lesson, scene, dojo, and memory tool is free to explore. Pro runs your code and remembers your learning across visits.

Scroll the tour: one illustrated room for every pattern the app teaches, each with a recall check and a free studio handoff.

1. Two sum II (sorted) Arrays
2. Valid palindrome Strings
3. Build a frequency table Hash Maps
4. Reverse linked list Linked Lists
5. Validate parentheses Stacks & Queues
6. Tree traversals Trees
7. Implement trie methods Tries
8. Heap operations Heaps
9. Search a sorted matrix Matrices
10. Department top three salaries Database
11. Subsets Backtracking
12. Number of Islands Graphs
13. Topological sort (DFS post-order) Graphs
14. Binary search Binary Search
15. Climbing Stairs Dynamic Programming
16. Edit Distance Dynamic Programming
17. Interval scheduling (activity selection) Greedy
18. Minimum window substring Sliding Window
19. 3Sum Sorting
20. Merge intervals Intervals
21. Subarray sum equals k Prefix Sum
22. Pow(x, n) Math
23. File line iterator Streams & I/O
24. LRU cache System Design

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