Function vertex_add_subtree_sum 

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

✅ AC 91ms

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	68 ± 1 ms
random_01	AC	76 ± 1 ms
random_02	AC	30 ± 1 ms
random_03	AC	41 ± 1 ms
random_04	AC	31 ± 0 ms
max_random_00	AC	84 ± 4 ms
max_random_01	AC	80 ± 0 ms
max_random_02	AC	80 ± 0 ms
line_00	AC	91 ± 2 ms
line_01	AC	89 ± 1 ms