Topic 12 — Tree BFS
Finished Fri, Sep 4, 2026, 4:44 PM ET: all 3 core problems closed, 3 problems closed that day.
Scheduled: Fri Sep 4, 2026 · Phase: Phase III — Hierarchical · Topic: #14 · Builds on: the queue primitive + Topic 11
Closed Sep 4 — the day the topic finished
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #106 | LC 102 · Level Order Traversal | core | medium | Sep 4 | py · docs |
| #107 | LC 199 · Right Side View | core | medium | Sep 4 | py · docs |
| #108 | LC 1448 · Count Good Nodes | core | medium | Sep 4 | py · docs |
Open at release
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #109 | LC 103 · Zigzag Level Order | optional | medium | — | — |
| #110 | LC 637 · Average of Levels | optional | easy | — | — |
20260904.204425.000000000 is timever for the UTC instant the core set completed; it tags 987eb7a, the last main commit before it.