Update course-schedule.py

kamyu104 · web-flow · commit 1d2fbcb20000 · 2022-12-30T01:58:30.000+08:00
diff --git a/Python/course-schedule.py b/Python/course-schedule.py
@@ -33,6 +33,9 @@ def canFinish(self, numCourses, prerequisites):
 
 # Time:  O(|V| + |E|)
 # Space: O(|E|)
+import collections
+
+
 # dfs solution
 class Solution2(object):
     def canFinish(self, numCourses, prerequisites):
