Week 12 · Day 4 · 2026-10-15 THU · MOCK B
Unseen mock B: privacy-safe feedback calibration
Exact Daily Blocks
Run a second unknown-system mock focused on feedback loops, privacy, accountability, and evaluator calibration.
| 08:50-10:55 | System design 45-minute adaptive mock: design a privacy-safe interview feedback and cohort calibration platform for system-design practice without leaking private transcripts or reinforcing biased scores. |
|---|---|
| 14:30-16:15 | NeetCode Backtracking Exactly three unique slots; each is 30m solve + 5m evidence. |
| 20:30-21:15 | Recall / mock repair Staff Q&A drill on accountability, consent, data reuse, cohort drift, and appeal/review workflow. |
DDIA decision links
Only exact Ch13/Ch14 sections that change Week 12 decisions are linked.
| Decision question | Exact DDIA section | Design consequence |
|---|---|---|
| Mock B: who is accountable for automated feedback and candidate scoring? | Ch14 - 责任与问责 | The design must assign accountable owners, audit logs, appeal/review workflow, and evaluator calibration. |
| Mock B: how can feedback loops distort future evaluations? | Ch14 - 反馈回路 | Cohort scores and training recommendations must be measured for self-reinforcing bias and rubric drift. |
Algorithm block
Diagnostic decision: select Backtracking, not a weakest prior tag, because no production scorecard records a weaker tag and final week needs recursive state-space pruning under pressure.
| Slot | Problem | Pattern | Invariant | Bug risk | Time | Space |
|---|---|---|---|---|---|---|
| 10 | Palindrome Partitioning NEW · Backtracking · 30m solve + 5m evidence | partition DFS | Every prefix chosen is a palindrome. | Repeated substring palindrome checks without clarity. | O(n 2^n) | O(n) stack + output |
| 11 | Restore IP Addresses NEW · Backtracking · 30m solve + 5m evidence | bounded segment DFS | Exactly four segments cover the whole string. | Allowing leading zeros or >255. | O(1) bounded | O(1) stack + output |
| 12 | N-Queens NEW · Backtracking · 30m solve + 5m evidence | row DFS with constraint sets | One queen per row; columns and diagonals are unavailable once occupied. | Diagonal keys row-col and row+col swapped inconsistently. | O(n!) | O(n) sets + board |
Output
| Deliverable | Mock B score, privacy/accountability decisions, and cohort-drift metric. |
|---|---|
| Artifacts | 30-project map Chinese synthesis Synthesis audio English recall Recall PDF Weak repair Repair audio Cohort crosswalk Mock B contract |
Detailed lecture notes, audio, recall scripts, PDFs, Staff Q&A, and mock packs are archived locally and are intentionally not published on this site.