leno23 · leno23 · May 17, 2026
diff --git a/leetcode-videos/0021-0030/0021-merge-two-sorted-lists.mp4 b/leetcode-videos/0021-0030/0021-merge-two-sorted-lists.mp4
diff --git a/leetcode-videos/0021-0030/0022-generate-parentheses.mp4 b/leetcode-videos/0021-0030/0022-generate-parentheses.mp4
diff --git a/leetcode-videos/0021-0030/0023-merge-k-sorted-lists.mp4 b/leetcode-videos/0021-0030/0023-merge-k-sorted-lists.mp4
diff --git a/leetcode-videos/0021-0030/0024-swap-nodes-in-pairs.mp4 b/leetcode-videos/0021-0030/0024-swap-nodes-in-pairs.mp4
diff --git a/leetcode-videos/0021-0030/0025-reverse-nodes-in-k-group.mp4 b/leetcode-videos/0021-0030/0025-reverse-nodes-in-k-group.mp4
diff --git a/leetcode-videos/0021-0030/0026-remove-duplicates-from-sorted-array.mp4 b/leetcode-videos/0021-0030/0026-remove-duplicates-from-sorted-array.mp4
diff --git a/leetcode-videos/0021-0030/0027-remove-element.mp4 b/leetcode-videos/0021-0030/0027-remove-element.mp4
diff --git a/leetcode-videos/0021-0030/0028-find-the-index-of-the-first-occurrence-in-a-string.mp4 b/leetcode-videos/0021-0030/0028-find-the-index-of-the-first-occurrence-in-a-string.mp4
diff --git a/leetcode-videos/0021-0030/0029-divide-two-integers.mp4 b/leetcode-videos/0021-0030/0029-divide-two-integers.mp4
diff --git a/leetcode-videos/0021-0030/0030-substring-with-concatenation-of-all-words.mp4 b/leetcode-videos/0021-0030/0030-substring-with-concatenation-of-all-words.mp4
diff --git a/leetcode-videos/0021-0030/README.md b/leetcode-videos/0021-0030/README.md
@@ -0,0 +1,12 @@
+# LeetCode 0021-0030 题解视频
+
+- 0021. Merge Two Sorted Lists — `0021-merge-two-sorted-lists.mp4`
+- 0022. Generate Parentheses — `0022-generate-parentheses.mp4`
+- 0023. Merge k Sorted Lists — `0023-merge-k-sorted-lists.mp4`
+- 0024. Swap Nodes in Pairs — `0024-swap-nodes-in-pairs.mp4`
+- 0025. Reverse Nodes in k-Group — `0025-reverse-nodes-in-k-group.mp4`
+- 0026. Remove Duplicates from Sorted Array — `0026-remove-duplicates-from-sorted-array.mp4`
+- 0027. Remove Element — `0027-remove-element.mp4`
+- 0028. Find the Index of the First Occurrence in a String — `0028-find-the-index-of-the-first-occurrence-in-a-string.mp4`
+- 0029. Divide Two Integers — `0029-divide-two-integers.mp4`
+- 0030. Substring with Concatenation of All Words — `0030-substring-with-concatenation-of-all-words.mp4`