Solution -「洛谷 P5610」「YunoOI 2013」大学
DescriptionLink.区间查 $x$ 的倍数并除掉,区间查和。Solution平衡树。首先有个基本的想法就是按 $a_{i}$ 开平衡树,即对于每个 $a_{i}$ 都开一棵平衡树,共...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.