PHASE 03
#๏ธโฃ Hash Maps & Sets
Hashing is the single most useful interview tool. Learn how hash maps work, when to use a set, and the counting and grouping patterns behind dozens of classic questions.
โฑ๏ธ ~2 hours of lessons
๐ 3 lessons
โ๏ธ 8 exercises Easy
โถ Start this phase
๐ฏ In this phase you willโฆ
- Explain how a hash table finds things fast
- Use sets for seen-before checks
- Use maps for counting, grouping and complements
๐บ Lessons in this playlist
๐ Phase test
Concept questions, pseudocode writing, tracing and debugging โ check youโre ready for the next phase.
๐ก Concept check
Which problem is a hash map the natural fit for?
