Topic 17 — Graph BFS
Finished Tue, Sep 22, 2026, 12:59 PM ET: all 2 core problems closed, 2 problems closed that day.
Scheduled: Tue Sep 22, 2026 · Phase: Phase IV — Relational · Topic: #19 · Builds on: Topic 12 + visited set — shortest path unweighted
Closed Sep 22 — the day the topic finished
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #137 | LC 994 · Rotting Oranges | core | medium | Sep 22 | py · docs |
| #138 | LC 127 · Word Ladder | core | hard | Sep 22 | py · docs |
Open at release
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #139 | LC 286 · Walls and Gates | optional | medium | — | — |
| #140 | LC 433 · Minimum Genetic Mutation | optional | medium | — | — |
| #141 | LC 909 · Snakes and Ladders | optional | medium | — | — |
| #215 | LC 1091 · Shortest Path in Binary Matrix | optional | medium | — | — |
20260922.165949.000000000 is timever for the UTC instant the core set completed; it tags 26085cc, the last main commit before it.