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Merge sort
- 03 Nov, 2025
Sorting & Searching Essentials
Week 15 notes: I rarely write a sort from scratch in an interview, but knowing the trade-offs and the 'sort first, then the problem gets easy' instinct is the real skill.
- 22 Sep, 2025
Recursion II: Divide & Conquer, Memoization
Week 9 notes: two ideas that take recursion from cute to actually powerful. Splitting problems in half, and caching subproblems so you never redo work.