---
changelog:
  category: Release
  version: 20260828.195254.000000000
date: '2026-08-28T19:52:54Z'
seo:
  description: >-
    Finished Fri, Aug 28, 2026, 3:52 PM ET: all 2 core problems closed, 2
    problems closed that day. Scheduled: Fri Aug 28, 2026 · Phase: Phase I —
    Linear…
title: Topic 07 — Monotonic Stack
type: changelog
---
<!-- release-topics: #9 -->
Finished Fri, Aug 28, 2026, 3:52 PM ET: all 2 core problems closed, 2 problems closed that day.

**Scheduled:** Fri Aug 28, 2026 · **Phase:** Phase I — Linear Structures · **Topic:** #9 · **Builds on:** Topic 6

## Closed Aug 28 — the day the topic finished

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #72 | LC 739 · Daily Temperatures | core | medium | Aug 28 | [py](https://github.com/prdlk/leetcode/blob/20260828.195254.000000000/work/Medium/Array/739.daily-temperatures.py) · [docs](https://lc.prd.lk/739) |
| #73 | LC 853 · Car Fleet | core | medium | Aug 28 | [py](https://github.com/prdlk/leetcode/blob/20260828.195254.000000000/work/Medium/Array/853.car-fleet.py) · [docs](https://lc.prd.lk/853) |

## Open at release

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #74 | LC 496 · Next Greater Element I | optional | easy | — | — |
| #75 | LC 901 · Online Stock Span | optional | medium | — | — |
| #76 | LC 84 · Largest Rectangle in Histogram | deferred | hard | — | — |
| #211 | LC 42 · Trapping Rain Water | deferred | hard | — | — |

---

`20260828.195254.000000000` is [timever](https://gist.github.com/twolfson/de1b004dd22536b8e668) for the UTC instant the core set completed; it tags 7384a33, the last main commit before it.