https://www.luogu.com.cn/problem/CF1446D2
根号分治,但是C++14贼慢,一直TLE。换成C++20就过了。是不是我哪里写挂了/yiw
https://codeforces.com/contest/1446/submission/241639881 AC
https://codeforces.com/contest/1446/submission/241640021 TLE