Function counting_spanning_tree_directed 

pub fn counting_spanning_tree_directed(reader: impl Read, writer: impl Write)

✅ AC 12ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
example_01	AC	0 ± 0 ms
example_02	AC	0 ± 0 ms
example_03	AC	0 ± 0 ms
small_00	AC	0 ± 0 ms
small_01	AC	0 ± 0 ms
small_02	AC	0 ± 0 ms
small_03	AC	0 ± 0 ms
small_04	AC	0 ± 0 ms
small_05	AC	0 ± 0 ms
small_06	AC	0 ± 0 ms
small_07	AC	0 ± 0 ms
small_08	AC	0 ± 0 ms
small_09	AC	0 ± 0 ms
random_00	AC	4 ± 1 ms
random_01	AC	5 ± 0 ms
random_02	AC	4 ± 0 ms
random_03	AC	0 ± 0 ms
random_04	AC	1 ± 0 ms
max_00	AC	12 ± 0 ms
max_01	AC	12 ± 0 ms
max_02	AC	12 ± 0 ms