Function directedmst 

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

✅ AC 92ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
example_01	AC	0 ± 0 ms
random_00	AC	41 ± 10 ms
random_01	AC	46 ± 2 ms
random_02	AC	33 ± 1 ms
random_03	AC	65 ± 4 ms
random_04	AC	18 ± 0 ms
max_random_00	AC	73 ± 5 ms
max_random_01	AC	67 ± 5 ms
max_random_02	AC	77 ± 8 ms
max_random_03	AC	92 ± 7 ms
max_random_04	AC	88 ± 5 ms