diff --git a/Duplicates_80.py b/Duplicates_80.py
new file mode 100644
index 00000000..5fdab961
--- /dev/null
+++ b/Duplicates_80.py
@@ -0,0 +1,13 @@
+class Solution:
+    def removeDuplicates(self, nums: List[int]) -> int:
+        if len(nums) <= 1:
+            return len(nums)
+
+        k = 2  # position to place next valid element
+
+        for i in range(2, len(nums)):
+            if nums[i] != nums[k - 2]:
+                nums[k] = nums[i]
+                k += 1
+
+        return k
\ No newline at end of file
diff --git a/Merge_88.py b/Merge_88.py
new file mode 100644
index 00000000..170f139d
--- /dev/null
+++ b/Merge_88.py
@@ -0,0 +1,19 @@
+class Solution:
+    def merge(self, nums1: List[int], m: int, nums2: List[int], n: int) -> None:
+        i = m - 1
+        j = n - 1
+        k = m + n - 1
+
+        while i >= 0 and j >= 0:
+            if nums1[i] > nums2[j]:
+                nums1[k] = nums1[i]
+                i -= 1
+            else:
+                nums1[k] = nums2[j]
+                j -= 1
+            k -= 1
+
+        while j >= 0:
+            nums1[k] = nums2[j]
+            j -= 1
+            k -= 1
\ No newline at end of file