Update network-delay-time.py

kamyu104 · web-flow · commit d599d775b5a3 · 2018-07-11T23:27:39.000+08:00
diff --git a/Python/network-delay-time.py b/Python/network-delay-time.py
@@ -17,9 +17,9 @@
 # - The length of times will be in the range [1, 6000].
 # - All edges times[i] = (u, v, w) will have 1 <= u, v <= N and 1 <= w <= 100.
 
+import collections
 import heapq
 
-
 # Dijkstra's algorithm
 class Solution(object):
     def networkDelayTime(self, times, N, K):
