diff --git a/rduplicates.py b/rduplicates.py
new file mode 100644
index 00000000..525d6a97
--- /dev/null
+++ b/rduplicates.py
@@ -0,0 +1,8 @@
+class Solution:
+    def removeDuplicates(self, nums: List[int]) -> int:
+        k = 0
+        for x in nums:
+            if k == 0 or x != nums[k - 1]:
+                nums[k] = x
+                k += 1
+        return k