Darbar 213 — Check If Every Row And Column Contains All Numbers

Easy

Darbar · Hash Table

Catalog slot 213 of 548 (source id 725). Topic hash table / matrix.

Solve on LeetCode: Check If Every Row And Column Contains All Numbers. 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: Tree and graph fluency (weeks 31-45, slots 201-280). Warmup: Tree traversals and adjacency-list graph walks. Exam: Tree+graph block with one design flavored problem.

Evidence (cookiecutter problem_213.md)

1. Attempt log (approaches that failed)
2. Final complexity (time and space)
3. One mistake corrected
4. Production concept this slot reinforces

Personal dates and the CSV tracker stay in the learner journal.

Same subtopic

• Flip Columns For Maximum Number Of Equal Rows · medium
• Number Of Submatrices That Sum To Target · hard

Hash Table index · Darbar hub

Darbar slot 213 of Tensor-to-Tenant · Previous · Next.