Algorithms & Complexity

Cost as input grows, the structures that change it, and the patterns interviews reuse.

3 concepts · 200 minutes

• Big-O & ComplexityHow cost grows with input — the vocabulary every technical interview assumes you have.
• Core Data StructuresArrays, hash maps, trees, heaps — and the operation costs that decide which one you reach for.
• Algorithm PatternsTwo pointers, sliding window, BFS/DFS, memoisation — recognising the pattern is 80% of the solve.