here's example problems.

https://www.codechef.com/START21B/problems/MSUB121

https://atcoder.jp/contests/abc219/tasks/abc219_g

is there any tag or name for n*sqrt(n) problems? or are they just ad-hoc? i can't even approach to these type of problems during the contest. i wanna practice but i don't know what to search.

Q : is there any tag or category for type of problems above? or any tutorial blogs for those