Topics — Problem Mind-Maps
Each subdirectory is one LeetCode-style grouping (arrays-hashing, graphs, dp-1d, …). Inside every problems/ folder you get one markdown file per curated question, named NNN-kebab-title.md.
Layout
topics/<topic>/problems/NNN-title.mdCanonical duplicates
Some numbers appear in multiple rows of the Problem index; only one on-disk file exists:
| Number | Canonical folder |
|---|---|
| 152 | Maximum Product Subarray (LeetCode 152) |
| 121, 53, 7, … | See the index note — follow the path in the index, not a second copy. |
Validation
From repo root:
./scripts/validate-problems.shChecks 12 required ## sections per file, including ## Diagram (with a ```mermaid block for visibility).
See also: Problem mind-map template, Similar problems map.
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