diff --git "a/leetcode3/\354\265\234\354\233\220\354\244\200/1329. Sort the Matrix Diagonally.py" "b/leetcode3/\354\265\234\354\233\220\354\244\200/1329. Sort the Matrix Diagonally.py"
new file mode 100644
index 00000000..c3f282ea
--- /dev/null
+++ "b/leetcode3/\354\265\234\354\233\220\354\244\200/1329. Sort the Matrix Diagonally.py"	
@@ -0,0 +1,32 @@
+class Solution:
+    def diagonalSort(self, mat: List[List[int]]) -> List[List[int]]:
+        def helper(a, b):
+            nums = []
+            row = a
+            col = b
+            while row < n and col < m:
+                nums.append(mat[row][col])
+                row += 1
+                col += 1
+            nums.sort()
+
+            row = a
+            col = b
+            idx = 0
+            while row < n and col < m:
+                mat[row][col] = nums[idx]
+                row += 1
+                col += 1
+                idx += 1
+
+        n = len(mat)
+        m = len(mat[0])
+
+        for top in range(m):
+            helper(0, top)           
+        
+        for left in range(1, n):
+            helper(left, 0)
+
+        return mat
+