Topic 15 — Trie
Finished Mon, Sep 21, 2026, 12:51 PM ET: all 2 core problems closed, 2 problems closed that day.
Scheduled: Mon Sep 21, 2026 · Phase: Phase III — Hierarchical · Topic: #17 · Builds on: Topic 11
Closed Sep 21 — the day the topic finished
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #127 | LC 208 · Implement Trie | core | medium | Sep 21 | py · docs |
| #128 | LC 211 · Add & Search Words | core | medium | Sep 21 | py · docs |
Open at release
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #129 | LC 212 · Word Search II | deferred | hard | — | — |
| #214 | LC 648 · Replace Words | optional | medium | — | — |
20260921.165108.000000000 is timever for the UTC instant the core set completed; it tags 204e178, the last main commit before it.