---
changelog:
  category: Topic
  version: 20260928.175800.000000000
date: '2026-09-28T17:58:00Z'
seo:
  description: >-
    Finished Mon, Sep 28, 2026, 1:58 PM ET: all 3 core problems closed, 3
    problems closed that day. Scheduled: Mon Sep 28, 2026 · Phase: Phase V —
    Decision Space…
title: Topic 22 — Multi-D / Grid DP
type: changelog
---
<!-- release-topics: #24 -->
Finished Mon, Sep 28, 2026, 1:58 PM ET: all 3 core problems closed, 3 problems closed that day.

**Scheduled:** Mon Sep 28, 2026 · **Phase:** Phase V — Decision Space · **Topic:** #24 · **Builds on:** Topic 21

## Closed Sep 28 — the day the topic finished

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #166 | LC 62 · Unique Paths | core | medium | Sep 28 | [py](https://github.com/prdlk/leetcode/blob/20260928.175800.000000000/work/1/Medium/Math/62.unique-paths.py) · [docs](https://lc.prd.lk/62) |
| #167 | LC 64 · Minimum Path Sum | core | medium | Sep 28 | [py](https://github.com/prdlk/leetcode/blob/20260928.175800.000000000/work/1/Medium/Array/64.minimum-path-sum.py) · [docs](https://lc.prd.lk/64) |
| #168 | LC 1143 · Longest Common Subsequence | core | medium | Sep 28 | [py](https://github.com/prdlk/leetcode/blob/20260928.175800.000000000/work/1/Medium/String/1143.longest-common-subsequence.py) · [docs](https://lc.prd.lk/1143) |

## Open at release

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #169 | LC 120 · Triangle | optional | medium | — | — |
| #170 | LC 63 · Unique Paths II | optional | medium | — | — |
| #171 | LC 72 · Edit Distance | deferred | medium | — | — |
| #172 | LC 97 · Interleaving String | deferred | medium | — | — |
| #173 | LC 221 · Maximal Square | deferred | medium | — | — |

---

`20260928.175800.000000000` is [timever](https://gist.github.com/twolfson/de1b004dd22536b8e668) for the UTC instant the core set completed; it tags 5b6a330, the last main commit before it.