Topic 10 — Matrix Index Math
Finished Wed, Sep 2, 2026, 4:52 PM ET: all 3 core problems closed, 3 problems closed that day.
Scheduled: Wed Sep 2, 2026 · Phase: Phase II — Nodal & Grid · Topic: #12 · Builds on: Topic 3 — NOT graph traversal
Closed Sep 2 — the day the topic finished
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #91 | LC 48 · Rotate Image | core | medium | Sep 2 | py · docs |
| #92 | LC 54 · Spiral Matrix | core | medium | Sep 2 | py · docs |
| #93 | LC 73 · Set Matrix Zeroes | core | medium | Sep 2 | py · docs |
Open at release
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #94 | LC 36 · Valid Sudoku | optional | medium | — | — |
| #95 | LC 289 · Game of Life | optional | medium | — | — |
20260902.205241.000000000 is timever for the UTC instant the core set completed; it tags 1e0e03d, the last main commit before it.