Function directedmst 

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

✅ AC 82ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
example_01	AC	0 ± 0 ms
random_00	AC	47 ± 7 ms
random_01	AC	60 ± 7 ms
random_02	AC	47 ± 4 ms
random_03	AC	82 ± 6 ms
random_04	AC	19 ± 1 ms
max_random_00	AC	82 ± 5 ms
max_random_01	AC	79 ± 6 ms
max_random_02	AC	79 ± 7 ms
max_random_03	AC	76 ± 9 ms
max_random_04	AC	77 ± 4 ms