Function directedmst 

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

✅ AC 91ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
example_01	AC	0 ± 0 ms
random_00	AC	41 ± 7 ms
random_01	AC	52 ± 4 ms
random_02	AC	19 ± 0 ms
random_03	AC	65 ± 4 ms
random_04	AC	11 ± 0 ms
max_random_00	AC	83 ± 2 ms
max_random_01	AC	81 ± 4 ms
max_random_02	AC	90 ± 3 ms
max_random_03	AC	84 ± 6 ms
max_random_04	AC	91 ± 5 ms