PHASE 02
๐ Arrays & Strings
Arrays and strings appear in almost every interview. Learn how they live in memory, the operations that are fast and slow, prefix sums for instant range totals, and walking 2D grids.
โฑ๏ธ ~2.5 hours of lessons
๐ 4 lessons
โ๏ธ 8 exercises Easy
โถ Start this phase
๐ฏ In this phase you willโฆ
- Explain array operations and their costs
- Process strings efficiently
- Use prefix sums for range queries
- Traverse 2D grids
