Darbar 194 — Check If N And Its Double Exist
Easy
Darbar · Hash Table
Catalog slot 194 of 548 (source id 696). Topic hash table / binary search.
Solve on LeetCode: Check If N And Its Double Exist. Do not treat this page as a statement dump.
Aligned T2T band: weeks 1–6. Start at Week 1. Full map: Darbar hub.
Pattern block: State machines and simulations (weeks 16-30, slots 121-200). Warmup: Simulation and state-transition drills. Exam: 2-3 state-machine problems in 60 minutes.
Also filed under: array / binary search, hash table / two pointer.
Evidence (cookiecutter problem_194.md)
- Attempt log (approaches that failed)
- Final complexity (time and space)
- One mistake corrected
- Production concept this slot reinforces
Personal dates and the CSV tracker stay in the learner journal.
Same subtopic
- Intersection Of Two Arrays · easy
- Intersection Of Two Arrays Ii · easy
- Number Of Flowers In Full Bloom · hard
Darbar slot 194 of Tensor-to-Tenant · Previous · Next.