제출 #20257

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "/tmp/target/Main.py", line 8, in <module>
    graph = defaultdict(list)
NameError: name 'defaultdict' is not defined

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "/tmp/target/Main.py", line 8, in <module>
    graph = defaultdict(list)
NameError: name 'defaultdict' is not defined

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "/tmp/target/Main.py", line 8, in <module>
    graph = defaultdict(list)
NameError: name 'defaultdict' is not defined

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