four loops in worst case instead one...

clever, but super slow. pure overkill

2024 new feature?

how is this best practises? I don't see anything being done the "best" way.

How does this finish in time

Eh sometimes you gotta use it, not here ig. This can be done in O(1) without any loops

words can't describe how I feel after refactoring my code at least four times over 3 days to arrive to pretty much this answer.

this's very clean

i write an O(n) solution. you can refer to it

This is THE way of solving this, thanks for sharing

std::map dict should be const, also as mentioned std::vector v is redundant versus map keys