Update restore-the-array-from-adjacent-pairs.py

kamyu104 · web-flow · commit 68b9223c428b · 2021-01-31T18:05:18.000+08:00
diff --git a/Python/restore-the-array-from-adjacent-pairs.py b/Python/restore-the-array-from-adjacent-pairs.py
@@ -1,6 +1,9 @@
 # Time:  O(n)
 # Space: O(n)
 
+import collections
+
+
 class Solution(object):
     def restoreArray(self, adjacentPairs):
         """
