drillforge
Type the load-bearing lines — the boundary logic that breaks under pressure. Execution grades them. Pick a topic.
- Binary Searchlo/hi bounds — < vs <=, mid ± 1, which half to keep21 problems
- Sliding Windowgrow and shrink the window — when to move each edge18 problems
- Linked Listprev / curr / next pointer moves and re-linking18 problems
- Two Pointersconverging or chasing pointers over an array9 problems
- Arrays & Hashinga map or set and one careful pass10 problems