제출 #37092

3
2 3
1 2

런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 13, in <module>
    if not parent[i]:
           ^^^^^^^^^
TypeError: list indices must be integers or slices, not NoneType

1
2

4
4 3
3 2
1 2

런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 13, in <module>
    if not parent[i]:
           ^^^^^^^^^
TypeError: list indices must be integers or slices, not NoneType

1
2
3

4
2 1
1 3
4 1

런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 13, in <module>
    if not parent[i]:
           ^^^^^^^^^
TypeError: list indices must be integers or slices, not NoneType

1
1
1