Sometimes, a problem will require an insight from “the gods”. Often, this is an idea which is so out of this world, it seems like the person who solves it must’ve seen the idea or answer before. This may be true, but with effort, the muscle can be built.

The sorting problem from div 3 a couple codeforces ago. Maybe end of october 2025.

Codeforces 1.

sum of squares problems.

minimize a function where it was just arithmetic and you just had to do the arithmetic on paper.