Week 10 · Day 7 · 2026-10-04 SUN · REPAIR · weekly gate
Synthesis and repair: stale facts, reservations, races, observability
今日目标
Synthesize Week 10 into a reusable mechanism map and repair the weakest answer.
| 08:50-09:00 | Set target Name the one Week 10 invariant that failed in mock. |
|---|---|
| 09:00-10:05 | Repair attempt Re-answer the weakest prompt without notes, then compare to scorecard. |
| 10:05-10:45 | Mechanism map Map location freshness, geospatial partitioning, match uniqueness, driver/inventory reservation, cancellation recovery. |
| 10:45-10:55 | Spoken close Final English answer: how to defend correctness during stale location and dispatch races. |
| 14:30-16:15 | NeetCode Tag · Intervals Exactly three contiguous slots; each slot is 30m solve + 5m evidence. |
| 20:30-21:15 | Recall / Mock 20:30-21:15 Final recall: one 90-second Uber answer, one 60-second Tinder transfer, one 60-second Local Delivery transfer. |
Live canonical source anchors
Daily anchors retain the original Hello Interview heading text.
今天不新增 Hello Interview 小节；复用 Week 10 已核验 anchors 做 mock 和 repair。
DDIA decision links
今天不新增 DDIA subsection；只复用本周已映射的决策卡。
Algorithm block
| Slot | Problem | Pattern | Invariant | Bug risk | Time | Space |
|---|---|---|---|---|---|---|
| 19 | Minimum Interval to Include Each Query NEW · 30m solve + 5m evidence | offline queries + heap | Heap stores intervals whose start <= query; discard end < query. | Returning stale heap top. | O((n+q) log n) | O(n+q) |
| 20 | Data Stream as Disjoint Intervals NEW · 30m solve + 5m evidence | online merge neighbors | Each number either extends, bridges, or creates one interval. | Duplicate number should not split/merge twice. | O(log n) | O(n) |
| 21 | Employee Free Time NEW · 30m solve + 5m evidence | k-list interval merge | Common free time is the gap between merged busy intervals. | Missing first/last unbounded gaps not part of answer. | O(n log n) | O(n) |
Output and repair
| Deliverable | Scorecard completed, production evidence recorded, READY_FOR_REVIEW in Week 10 production record. |
|---|---|
| Repair rule | Do not open the following week; only repair Week 10 evidence or links if a check fails. |
| Artifacts | Artifact contract Re-attempt gate |
| English recall | English recall: defend freshness, reservation, race recovery, fairness, and observability without reading notes. |
Detailed lecture notes, audio, recall scripts, PDFs, Staff Q&A, and mock packs are archived locally and are intentionally not published on this site.