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docs(readme): add videos command and update schedule dates and badges

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<p align="center">
<a href="https://x.com/basedprad"><img alt="follow" src="https://shieldcn.dev/x/follow/basedprad.svg" /></a>
<img alt="Custom badge" src="https://shieldcn.dev/badge/view-@prdlk.svg?logo=leetcode" />
<a href="https://lc.prad.nu"><img alt="badge" src="https://shieldcn.dev/badge/Read-Documentation.svg?logo=lu%3ABook" /></a>
<a href="https://lc.prad.nu/progress"><img alt="gate pass rate" src="https://srs-api.prdlk.workers.dev/badge/gate.svg" /></a>
</p>
<p align="center">
<sub>8-week interview-prep fight camp. Each phase is a milestone; each topic an issue; each problem a sub-issue.<br>
New topic Mon–Fri, gate on Saturday, Sunday off — every solve comes back at <strong>+3</strong> and <strong>+7</strong> days,
the two windows that keep the rest day clear (a Thursday solve's +3 slides to Monday).<br>
Charts are live from the SRS Worker, never committed: pushing a solution or tapping the daily digest moves them within ~5 min.</sub>
Charts are live from the SRS Worker — the daily digest email drives the schedule.</sub>
</p>
<table align="center">
<tr>
<td colspan="2" align="center"><img alt="phase progress" width="100%" src="https://srs-api.prdlk.workers.dev/chart/progress.svg" /></td>
</tr>
<tr>
<td align="center" width="53%"><img alt="SRS ladder — new / +3 / +7 / retired" width="100%" src="https://srs-api.prdlk.workers.dev/chart/ladder.svg" /></td>
<td align="center" width="47%"><img alt="attempt heatmap" width="100%" src="https://srs-api.prdlk.workers.dev/chart/heatmap.svg" /></td>
</tr>
</table>
<p align="center">
<img alt="phase progress" src="https://shieldcn.dev/chart/npm/zod.svg" />
</p>
<p align="center">
<img alt="SRS ladder" src="https://shieldcn.dev/chart/npm/zod.svg" />
</p>
<p align="center">
<img alt="attempt heatmap" src="https://shieldcn.dev/chart/npm/zod.svg" />
</p>
## Phase I — Linear Structures · Weeks 1–2
@@ -212,7 +212,7 @@
<tr><td align="center"><code>B</code> ⭐</td><td align="center">295</td><td><a href="https://leetcode.com/problems/find-median-from-data-stream/">Find Median from Data Stream</a></td></tr>
<tr><td align="center"><code>B</code> ⭐</td><td align="center">502</td><td><a href="https://leetcode.com/problems/ipo/">IPO</a></td></tr>
<tr>
<td rowspan="3"><a href="https://github.com/prdlk/leetcode/issues/17"><strong>15. Trie</strong></a><br><sub>Wk 6 · Mon Sep 21</sub><br><sub>builds on 11</sub></td>
<td rowspan="3"><a href="https://github.com/prdlk/leetcode/issues/17"><strong>15. Trie</strong></a><br><sub>Wk 4 · Wed Sep 9</sub><br><sub>builds on 11</sub></td>
<td align="center"><code>A</code></td><td align="center">208</td><td><a href="https://leetcode.com/problems/implement-trie-prefix-tree/">Implement Trie</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">211</td><td><a href="https://leetcode.com/problems/design-add-and-search-words-data-structure/">Add &amp; Search Words</a></td></tr>
@@ -234,7 +234,7 @@
</thead>
<tbody>
<tr>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/18"><strong>16. Graph DFS</strong></a><br><sub>Wk 6 · Mon Sep 21</sub><br><sub>builds on 11 + visited set</sub></td>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/18"><strong>16. Graph DFS</strong></a><br><sub>Wk 4 · Thu Sep 10</sub><br><sub>builds on 11 + visited set</sub></td>
<td align="center"><code>A</code></td><td align="center">200</td><td><a href="https://leetcode.com/problems/number-of-islands/">Number of Islands</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">695</td><td><a href="https://leetcode.com/problems/max-area-of-island/">Max Area of Island</a></td></tr>
@@ -244,7 +244,7 @@
<tr><td align="center"><code>B</code></td><td align="center">399</td><td><a href="https://leetcode.com/problems/evaluate-division/">Evaluate Division</a></td></tr>
<tr><td align="center"><code>B</code></td><td align="center">261</td><td><a href="https://leetcode.com/problems/graph-valid-tree/">Graph Valid Tree</a></td></tr>
<tr>
<td rowspan="5"><a href="https://github.com/prdlk/leetcode/issues/19"><strong>17. Graph BFS</strong></a><br><sub>Wk 6 · Tue Sep 22</sub><br><sub>builds on 12 + visited set — shortest path unweighted</sub></td>
<td rowspan="5"><a href="https://github.com/prdlk/leetcode/issues/19"><strong>17. Graph BFS</strong></a><br><sub>Wk 4 · Fri Sep 11</sub><br><sub>builds on 12 + visited set — shortest path unweighted</sub></td>
<td align="center"><code>A</code></td><td align="center">994</td><td><a href="https://leetcode.com/problems/rotting-oranges/">Rotting Oranges</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">127</td><td><a href="https://leetcode.com/problems/word-ladder/">Word Ladder</a></td></tr>
@@ -252,14 +252,14 @@
<tr><td align="center"><code>B</code></td><td align="center">433</td><td><a href="https://leetcode.com/problems/minimum-genetic-mutation/">Minimum Genetic Mutation</a></td></tr>
<tr><td align="center"><code>B</code></td><td align="center">286</td><td><a href="https://leetcode.com/problems/walls-and-gates/">Walls and Gates</a></td></tr>
<tr>
<td rowspan="4"><a href="https://github.com/prdlk/leetcode/issues/20"><strong>18. Topological Sort</strong></a><br><sub>Wk 6 · Tue Sep 22</sub><br><sub>builds on 16</sub></td>
<td rowspan="4"><a href="https://github.com/prdlk/leetcode/issues/20"><strong>18. Topological Sort</strong></a><br><sub>Wk 5 · Mon Sep 14</sub><br><sub>builds on 16</sub></td>
<td align="center"><code>A</code></td><td align="center">207</td><td><a href="https://leetcode.com/problems/course-schedule/">Course Schedule</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">210</td><td><a href="https://leetcode.com/problems/course-schedule-ii/">Course Schedule II</a></td></tr>
<tr><td align="center"><code>B</code> ⭐</td><td align="center">269</td><td><a href="https://leetcode.com/problems/alien-dictionary/">Alien Dictionary</a></td></tr>
<tr><td align="center"><code>B</code></td><td align="center">1462</td><td><a href="https://leetcode.com/problems/course-schedule-iv/">Course Schedule IV</a></td></tr>
<tr>
<td rowspan="4"><a href="https://github.com/prdlk/leetcode/issues/21"><strong>19. Union-Find</strong></a><br><sub>Wk 6 · Wed Sep 23</sub><br><sub>builds on 16's problem class</sub></td>
<td rowspan="4"><a href="https://github.com/prdlk/leetcode/issues/21"><strong>19. Union-Find</strong></a><br><sub>Wk 5 · Tue Sep 15</sub><br><sub>builds on 16's problem class</sub></td>
<td align="center"><code>A</code></td><td align="center">684</td><td><a href="https://leetcode.com/problems/redundant-connection/">Redundant Connection</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">323</td><td><a href="https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/">Number of Connected Components</a></td></tr>
@@ -282,7 +282,7 @@
</thead>
<tbody>
<tr>
<td rowspan="8"><a href="https://github.com/prdlk/leetcode/issues/22"><strong>20. Backtracking</strong></a><br><sub>Wk 6 · Thu Sep 24</sub><br><sub>builds on 16 — then unlock LC 212 from topic 15</sub></td>
<td rowspan="8"><a href="https://github.com/prdlk/leetcode/issues/22"><strong>20. Backtracking</strong></a><br><sub>Wk 5 · Wed Sep 16</sub><br><sub>builds on 16 — then unlock LC 212 from topic 15</sub></td>
<td align="center"><code>A</code></td><td align="center">78</td><td><a href="https://leetcode.com/problems/subsets/">Subsets</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">39</td><td><a href="https://leetcode.com/problems/combination-sum/">Combination Sum</a></td></tr>
@@ -293,7 +293,7 @@
<tr><td align="center"><code>B</code></td><td align="center">22</td><td><a href="https://leetcode.com/problems/generate-parentheses/">Generate Parentheses</a></td></tr>
<tr><td align="center"><code>B</code> ⭐</td><td align="center">52</td><td><a href="https://leetcode.com/problems/n-queens-ii/">N-Queens II</a></td></tr>
<tr>
<td rowspan="9"><a href="https://github.com/prdlk/leetcode/issues/23"><strong>21. 1-D Dynamic Programming</strong></a><br><sub>Wk 6 · Fri Sep 25</sub><br><sub>builds on 20</sub></td>
<td rowspan="9"><a href="https://github.com/prdlk/leetcode/issues/23"><strong>21. 1-D Dynamic Programming</strong></a><br><sub>Wk 5 · Thu Sep 17</sub><br><sub>builds on 20</sub></td>
<td align="center"><code>A</code></td><td align="center">70</td><td><a href="https://leetcode.com/problems/climbing-stairs/">Climbing Stairs</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">746</td><td><a href="https://leetcode.com/problems/min-cost-climbing-stairs/">Min Cost Climbing Stairs</a></td></tr>
@@ -305,7 +305,7 @@
<tr><td align="center"><code>B</code></td><td align="center">91</td><td><a href="https://leetcode.com/problems/decode-ways/">Decode Ways</a></td></tr>
<tr><td align="center"><code>B</code></td><td align="center">647</td><td><a href="https://leetcode.com/problems/palindromic-substrings/">Palindromic Substrings</a></td></tr>
<tr>
<td rowspan="8"><a href="https://github.com/prdlk/leetcode/issues/24"><strong>22. Multi-D / Grid DP</strong></a><br><sub>Wk 7 · Mon Sep 28</sub><br><sub>builds on 21</sub></td>
<td rowspan="8"><a href="https://github.com/prdlk/leetcode/issues/24"><strong>22. Multi-D / Grid DP</strong></a><br><sub>Wk 5 · Fri Sep 18</sub><br><sub>builds on 21</sub></td>
<td align="center"><code>A</code></td><td align="center">62</td><td><a href="https://leetcode.com/problems/unique-paths/">Unique Paths</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">64</td><td><a href="https://leetcode.com/problems/minimum-path-sum/">Minimum Path Sum</a></td></tr>
@@ -316,7 +316,7 @@
<tr><td align="center"><code>B</code></td><td align="center">221</td><td><a href="https://leetcode.com/problems/maximal-square/">Maximal Square</a></td></tr>
<tr><td align="center"><code>B</code> ⭐</td><td align="center">97</td><td><a href="https://leetcode.com/problems/interleaving-string/">Interleaving String</a></td></tr>
<tr>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/25"><strong>23. Greedy</strong></a><br><sub>Wk 7 · Tue Sep 29</sub><br><sub>builds on 21 — includes Kadane's</sub></td>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/25"><strong>23. Greedy</strong></a><br><sub>Wk 6 · Mon Sep 21</sub><br><sub>builds on 21 — includes Kadane's</sub></td>
<td align="center"><code>A</code></td><td align="center">53</td><td><a href="https://leetcode.com/problems/maximum-subarray/">Maximum Subarray</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">55</td><td><a href="https://leetcode.com/problems/jump-game/">Jump Game</a></td></tr>
@@ -326,7 +326,7 @@
<tr><td align="center"><code>B</code></td><td align="center">918</td><td><a href="https://leetcode.com/problems/maximum-sum-circular-subarray/">Maximum Sum Circular Subarray</a></td></tr>
<tr><td align="center"><code>B</code></td><td align="center">763</td><td><a href="https://leetcode.com/problems/partition-labels/">Partition Labels</a></td></tr>
<tr>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/26"><strong>24. Intervals</strong></a><br><sub>Wk 7 · Wed Sep 30</sub><br><sub>builds on 23</sub></td>
<td rowspan="7"><a href="https://github.com/prdlk/leetcode/issues/26"><strong>24. Intervals</strong></a><br><sub>Wk 6 · Tue Sep 22</sub><br><sub>builds on 23</sub></td>
<td align="center"><code>A</code></td><td align="center">57</td><td><a href="https://leetcode.com/problems/insert-interval/">Insert Interval</a></td>
</tr>
<tr><td align="center"><code>A</code></td><td align="center">56</td><td><a href="https://leetcode.com/problems/merge-intervals/">Merge Intervals</a></td></tr>
@@ -337,4 +337,3 @@
<tr><td align="center"><code>B</code></td><td align="center">252</td><td><a href="https://leetcode.com/problems/meeting-rooms/">Meeting Rooms I</a></td></tr>
</tbody>
</table>