If your solution is using a function from the standard library, then there's probably where the nefarious character is being introduced. Remember that the directive

#include <some_library>

is just pasting the code from the some_library file.

cool

this is great!

certified bruh moment

I was hesitant to submit my solution because I thought that all users would come with complicated one liners that would make my solution look like garbage, but I'm glad to see that apparently we all came up with the same answer.