Function vertex_add_subtree_sum 

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

✅ AC 96ms

problem here

Detail

Case Name	Status	Exec Time
example_00	AC	0 ± 0 ms
small_00	AC	0 ± 0 ms
small_01	AC	0 ± 0 ms
small_02	AC	0 ± 0 ms
small_03	AC	0 ± 0 ms
small_04	AC	0 ± 0 ms
random_00	AC	71 ± 2 ms
random_01	AC	80 ± 1 ms
random_02	AC	30 ± 1 ms
random_03	AC	45 ± 3 ms
random_04	AC	32 ± 0 ms
max_random_00	AC	91 ± 4 ms
max_random_01	AC	89 ± 6 ms
max_random_02	AC	91 ± 5 ms
line_00	AC	96 ± 3 ms
line_01	AC	95 ± 3 ms