Function vertex_add_subtree_sum 

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

✅ AC 144ms

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	105 ± 19 ms
random_01	AC	112 ± 12 ms
random_02	AC	33 ± 1 ms
random_03	AC	55 ± 2 ms
random_04	AC	34 ± 5 ms
max_random_00	AC	136 ± 13 ms
max_random_01	AC	144 ± 18 ms
max_random_02	AC	138 ± 12 ms
line_00	AC	124 ± 6 ms
line_01	AC	131 ± 10 ms