Design a Data Structure — Practice Problems
Ten problems that drill the design-a-data-structure pattern from Lesson 27. Each…
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Math & Geometry — Practice Problems
Ten problems that drill the math & geometry pattern from Lesson 26 — the in…
Advanced Graphs — Practice Problems
Ten problems that drill the weighted-graph algorithms from Lesson 23. The…
String Algorithms — Practice Problems
Ten problems that drill KMP’s prefix function and Rabin-Karp’s rolling hash from…
Advanced DP — Practice Problems
Ten problems that drill bitmask, interval, and tree DP from Lesson 24. The work…
Greedy Algorithms — Practice Problems
Eleven problems that drill the greedy pattern from Lesson 22. The real exercise…
Tries — Practice Problems
Ten problems that drill the trie pattern from Lesson 20. Build the dict-of-dicts…
Bit Manipulation — Practice Problems
Ten problems that drill the bit manipulation tricks from Lesson 21. The whole…
Dynamic Programming I (1-D) — Practice Problems
Thirteen problems that drill 1-D dynamic programming from Lesson 17. The hard 9…
Dynamic Programming II (2-D) — Practice Problems
Twelve problems that drill 2-D dynamic programming from Lesson 18 — two-sequence…
Heaps / Top-K — Practice Problems
Eleven problems that drill heaps / top-K from Lesson 14. The one trick to burn…
Graphs — Practice Problems
Twelve problems that drill the graph toolkit from Lesson 16 — DFS, BFS…
Binary Search — Practice Problems
Thirteen problems that drill the binary-search pattern from Lesson 10 — the…
Tree BFS — Practice Problems
Ten problems that drill the breadth-first search / level-order pattern from…
Backtracking — Practice Problems
Twelve problems that drill backtracking from Lesson 15. They all run the same…
Linked-List Reversal — Practice Problems
Ten problems that drill the linked-list reversal / pointer-surgery pattern from…
Tree DFS — Practice Problems
Thirteen problems that drill tree DFS from Lesson 13. The skill is recursion…
Merge Intervals — Practice Problems
Ten problems that drill the merge-intervals pattern from Lesson 8. The recipe is…
Prefix Sums — Practice Problems
Ten problems that drill the prefix-sum pattern from Lesson 7. The big idea keeps…
Monotonic Stack — Practice Problems
Eleven problems that drill the stack and monotonic-stack pattern from Lesson…
Hash Maps & Frequency — Practice Problems
Thirteen problems that drill the hash map & frequency pattern from Lesson 6. The…
Fast & Slow Pointers — Practice Problems
Ten problems that drill the fast & slow pointer pattern (Floyd’s tortoise-and…
Sliding Window — Practice Problems
Twelve problems that drill the sliding-window pattern from Lesson 4. The reps…
Two Pointers — Practice Problems
Twelve problems that drill the two-pointer pattern from Lesson 3. The reps are…
Mock Interview Walkthrough
Reading about system design is one thing. Performing under interview pressure is…