Function unionfind 

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

✅ AC 13ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
random_00	AC	10 ± 0 ms
random_01	AC	10 ± 0 ms
random_02	AC	7 ± 0 ms
random_03	AC	1 ± 0 ms
random_04	AC	4 ± 0 ms
random_05	AC	8 ± 0 ms
random_06	AC	6 ± 1 ms
random_07	AC	0 ± 0 ms
random_08	AC	2 ± 0 ms
random_09	AC	12 ± 1 ms
max_random_00	AC	13 ± 0 ms
max_random_01	AC	13 ± 1 ms
max_random_02	AC	10 ± 1 ms
path_00	AC	9 ± 0 ms
path_01	AC	9 ± 0 ms
path_02	AC	6 ± 1 ms
path_03	AC	6 ± 1 ms