diff --git a/docs/notes/Leetcode 题解.md b/docs/notes/Leetcode 题解.md
index 97d4c6e4..7687a4d4 100644
--- a/docs/notes/Leetcode 题解.md	
+++ b/docs/notes/Leetcode 题解.md	
@@ -2316,7 +2316,7 @@ public void solveSudoku(char[][] board) {
             colsUsed[j][num] = true;
             cubesUsed[cubeNum(i, j)][num] = true;
         }
-        backtracking(i, 0);
+        backtracking(0, 0);
 }
 
 private boolean backtracking(int row, int col) {
diff --git a/docs/notes/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg b/docs/notes/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg
new file mode 100644
index 00000000..9af7bc09
Binary files /dev/null and b/docs/notes/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg differ
diff --git a/docs/notes/pics/PPjwP.png b/docs/notes/pics/PPjwP.png
new file mode 100644
index 00000000..80631505
Binary files /dev/null and b/docs/notes/pics/PPjwP.png differ
diff --git a/docs/notes/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg b/docs/notes/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg
new file mode 100644
index 00000000..d710e659
Binary files /dev/null and b/docs/notes/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg differ
diff --git a/docs/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg b/docs/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg
new file mode 100644
index 00000000..9af7bc09
Binary files /dev/null and b/docs/pics/474e5579-38b1-47d2-8f76-a13ae086b039.jpg differ
diff --git a/docs/pics/PPjwP.png b/docs/pics/PPjwP.png
new file mode 100644
index 00000000..80631505
Binary files /dev/null and b/docs/pics/PPjwP.png differ
diff --git a/docs/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg b/docs/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg
new file mode 100644
index 00000000..d710e659
Binary files /dev/null and b/docs/pics/f76067a5-7d5f-4135-9549-8199c77d8f1c.jpg differ