diff --git a/medium/find_the_prefix_common_array_of_two_arrays.py b/medium/find_the_prefix_common_array_of_two_arrays.py
new file mode 100644
index 0000000..d840b2f
--- /dev/null
+++ b/medium/find_the_prefix_common_array_of_two_arrays.py
@@ -0,0 +1,18 @@
+# https://leetcode.com/problems/find-the-prefix-common-array-of-two-arrays
+
+from typing import List
+
+class Solution:
+    def findThePrefixCommonArray(self, A: List[int], B: List[int]) -> List[int]:
+        result = []
+        count = {}
+        curr = 0
+        for i in range(len(A)):
+            count[A[i]] = count.get(A[i], 0) + 1
+            if count[A[i]] > 1:
+                curr += 1
+            count[B[i]] = count.get(B[i], 0) + 1
+            if count[B[i]] > 1:
+                curr += 1
+            result.append(curr)
+        return result