Update count-number-of-pairs-with-absolute-difference-k.py

Author: kamyu104

Python/count-number-of-pairs-with-absolute-difference-k.py

@@ -1,6 +1,9 @@
 # Time:  O(n)
 # Space: O(n)
 
+import collections
+
+
 class Solution(object):
     def countKDifference(self, nums, k):
         """