Create 2367.py

Author: chandansgowda

2001-2500/2367.py

@@ -0,0 +1,9 @@
+class Solution:
+    def arithmeticTriplets(self, nums: List[int], diff: int) -> int:
+        ans = 0
+        s = set(nums)
+        for num in nums:
+            if num+diff in s and num+2*diff in s:
+                ans += 1
+        return ans
+