Darbar 034 — Matrix Block Sum
Medium
Darbar · Array
Catalog slot 34 of 548 (source id 155). Topic array / prefix-sum.
Solve on LeetCode: Matrix Block Sum. 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: Timed routing (weeks 1-15, slots 1-120). Warmup: LeetCode-style easy problems (15 min each). Exam: Weekly timed block, 3-5 problems in 60 minutes.
Evidence (cookiecutter problem_034.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
- Running Sum Of 1D Array · easy
- Find The Highest Altitude · easy
- Find Pivot Index · easy
- Maximum Xor For Each Query · medium
Darbar slot 34 of Tensor-to-Tenant · Previous · Next.