---
changelog:
  category: Release
  version: 20260914.165008.000000000
date: '2026-09-14T16:50:08Z'
seo:
  description: >-
    Finished Mon, Sep 14, 2026, 12:50 PM ET: all 3 core problems closed, 3
    problems closed that day. Scheduled: Tue Sep 8, 2026 · Phase: Phase III —
    Hierarchical…
title: Topic 14 — Heap / Priority Queue
type: changelog
---
<!-- release-topics: #16 -->
Finished Mon, Sep 14, 2026, 12:50 PM ET: all 3 core problems closed, 3 problems closed that day.

**Scheduled:** Tue Sep 8, 2026 · **Phase:** Phase III — Hierarchical · **Topic:** #16 · **Builds on:** implicit tree over array

## Closed Sep 14 — the day the topic finished

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #118 | LC 215 · Kth Largest in Array | core | medium | Sep 14 | [py](https://github.com/prdlk/leetcode/blob/20260914.165008.000000000/work/1/Medium/Array/215.kth-largest-element-in-an-array.py) · [docs](https://lc.prd.lk/215) |
| #119 | LC 973 · K Closest Points | core | medium | Sep 14 | [py](https://github.com/prdlk/leetcode/blob/20260914.165008.000000000/work/1/Medium/Array/973.k-closest-points-to-origin.py) · [docs](https://lc.prd.lk/973) |
| #120 | LC 23 · Merge K Sorted Lists | core | hard | Sep 14 | [py](https://github.com/prdlk/leetcode/blob/20260914.165008.000000000/work/1/Hard/Linked%20List/23.merge-k-sorted-lists.py) · [docs](https://lc.prd.lk/23) |

## Open at release

| Issue | Problem | Set | Difficulty | Closed (ET) | Solution |
| --- | --- | --- | --- | --- | --- |
| #121 | LC 703 · Kth Largest in Stream | optional | easy | — | — |
| #122 | LC 621 · Task Scheduler | optional | medium | — | — |
| #123 | LC 1046 · Last Stone Weight | optional | easy | — | — |
| #124 | LC 373 · K Pairs with Smallest Sums | optional | medium | — | — |
| #125 | LC 295 · Find Median from Data Stream | deferred | hard | — | — |
| #126 | LC 502 · IPO | deferred | hard | — | — |

---

`20260914.165008.000000000` is [timever](https://gist.github.com/twolfson/de1b004dd22536b8e668) for the UTC instant the core set completed; it tags 00f44a1, the last main commit before it.