Topic 09 — Hybrid Structures
Finished Tue, Sep 1, 2026, 2:22 PM ET: all 2 core problems closed, 2 problems closed that day.
Scheduled: Tue Sep 1, 2026 · Phase: Phase II — Nodal & Grid · Topic: #11 · Builds on: Topics 1 + 8
Closed Sep 1 — the day the topic finished
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #87 | LC 146 · LRU Cache | core | medium | Sep 1 | py · docs |
| #88 | LC 2 · Add Two Numbers | core | medium | Sep 1 | py · docs |
Open at release
| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
|---|---|---|---|---|---|
| #89 | LC 138 · Copy List with Random Pointer | optional | medium | — | — |
| #90 | LC 380 · Insert Delete GetRandom O(1) | optional | medium | — | — |
20260901.182216.000000000 is timever for the UTC instant the core set completed; it tags cc29304, the last main commit before it.