Because there's no need to create another copy of str.

string str : is a fixed, read-only string stored in memory. You cannot modify it. so it is more correct and safer to be (const) char[]

go code by yourself, don't rely on Mathematics

...for what reason exactly?

Maths are much better for performance than just bruteforce.

Work smarter, not harder.

huuuuuuuuuuuhh i still didnt learn pascal triangle (11G) and when i see solutions like this i feel like that i overthink stuff, what should i do?

plz can u explain why u wrote it like that?
like how it came to u to think about it

I will unmute you tomorrow.

Use spoiler flag next time.

#include <algorithm'> is not necessary here since the function used is part of the string library, not the algorithm library.