leno23 · leno23 · May 18, 2026
diff --git a/leetcode-videos/0031-0040/0031-next-permutation.mp4 b/leetcode-videos/0031-0040/0031-next-permutation.mp4
diff --git a/leetcode-videos/0031-0040/0032-longest-valid-parentheses.mp4 b/leetcode-videos/0031-0040/0032-longest-valid-parentheses.mp4
diff --git a/leetcode-videos/0031-0040/0033-search-in-rotated-sorted-array.mp4 b/leetcode-videos/0031-0040/0033-search-in-rotated-sorted-array.mp4
diff --git a/leetcode-videos/0031-0040/0034-find-first-and-last-position-of-element-in-sorted-array.mp4 b/leetcode-videos/0031-0040/0034-find-first-and-last-position-of-element-in-sorted-array.mp4
diff --git a/leetcode-videos/0031-0040/0035-search-insert-position.mp4 b/leetcode-videos/0031-0040/0035-search-insert-position.mp4
diff --git a/leetcode-videos/0031-0040/0036-valid-sudoku.mp4 b/leetcode-videos/0031-0040/0036-valid-sudoku.mp4
diff --git a/leetcode-videos/0031-0040/0037-sudoku-solver.mp4 b/leetcode-videos/0031-0040/0037-sudoku-solver.mp4
diff --git a/leetcode-videos/0031-0040/0038-count-and-say.mp4 b/leetcode-videos/0031-0040/0038-count-and-say.mp4
diff --git a/leetcode-videos/0031-0040/0039-combination-sum.mp4 b/leetcode-videos/0031-0040/0039-combination-sum.mp4
diff --git a/leetcode-videos/0031-0040/0040-combination-sum-ii.mp4 b/leetcode-videos/0031-0040/0040-combination-sum-ii.mp4
diff --git a/leetcode-videos/0031-0040/README.md b/leetcode-videos/0031-0040/README.md
@@ -0,0 +1,12 @@
+# LeetCode 0031-0040 题解视频
+
+- 0031. Next Permutation — `0031-next-permutation.mp4`
+- 0032. Longest Valid Parentheses — `0032-longest-valid-parentheses.mp4`
+- 0033. Search in Rotated Sorted Array — `0033-search-in-rotated-sorted-array.mp4`
+- 0034. Find First and Last Position of Element in Sorted Array — `0034-find-first-and-last-position-of-element-in-sorted-array.mp4`
+- 0035. Search Insert Position — `0035-search-insert-position.mp4`
+- 0036. Valid Sudoku — `0036-valid-sudoku.mp4`
+- 0037. Sudoku Solver — `0037-sudoku-solver.mp4`
+- 0038. Count and Say — `0038-count-and-say.mp4`
+- 0039. Combination Sum — `0039-combination-sum.mp4`
+- 0040. Combination Sum II — `0040-combination-sum-ii.mp4`