Function lca 

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

✅ AC 30ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
random_00	AC	23 ± 3 ms
random_01	AC	24 ± 2 ms
random_02	AC	9 ± 1 ms
random_03	AC	9 ± 0 ms
random_04	AC	8 ± 0 ms
line_00	AC	23 ± 0 ms
line_01	AC	25 ± 1 ms
line_02	AC	15 ± 1 ms
line_03	AC	6 ± 0 ms
line_04	AC	7 ± 0 ms
max_line_00	AC	30 ± 1 ms
max_line_01	AC	29 ± 0 ms
max_line_02	AC	30 ± 1 ms
max_random_00	AC	26 ± 0 ms
max_random_01	AC	25 ± 0 ms
max_random_02	AC	25 ± 1 ms
binary_00	AC	26 ± 1 ms
binary_01	AC	24 ± 0 ms
binary_02	AC	25 ± 0 ms
path_graph_root_centroid_00	AC	21 ± 1 ms
path_graph_root_centroid_01	AC	22 ± 1 ms
path_graph_root_centroid_02	AC	21 ± 1 ms
almost_line_00	AC	30 ± 1 ms
almost_line_01	AC	29 ± 0 ms