diff --git a/LeetCode/0448-Find-All-Numbers-Disappeared-in-an-Array.py b/LeetCode/0448-Find-All-Numbers-Disappeared-in-an-Array.py
new file mode 100644
index 0000000..ba1f630
--- /dev/null
+++ b/LeetCode/0448-Find-All-Numbers-Disappeared-in-an-Array.py
@@ -0,0 +1,12 @@
+class Solution:
+    def findDisappearedNumbers(self, nums: List[int]) -> List[int]:
+        List=[]
+        for i in range(len(nums)):
+            val= abs(nums[i])-1
+            if(nums[val]>0):
+                nums[val]=-nums[val]
+        for i in range(len(nums)):
+            if(nums[i]>0):
+                List.append(i+1)
+        return List
+