https://oi-wiki.org/ds/fenwick/#%E5%8C%BA%E9%97%B4%E5%8A%A0%E5%8C%BA%E9%97%B4%E5%92%8C
by Hughpig @ 2023-10-03 09:07:47
0
10^6 nlogn可以过吧
by shoot_down @ 2023-10-03 09:22:51
@[shoot_down](/user/616964) 其实是可以的，但是差分比较麻烦
by Revdream @ 2023-10-03 23:19:36