It... Works?

Question

I was having a hard time with the transportation challenge and started moving things around. Well I got it but I don't really understand what I did correctly. the last thing i did was swap chair and person on line 9. i know its an odd question but, why does my code work?

#include <iostream>
using namespace std;

int main() {

int person, chair, empty, bus;
cin >> person;
chair = 50;
bus = person %50 - chair;
cout << bus *-1;

return 0;
}

Edit: to clarify I'm not great at math and mostly wondering why swapping person and chair fixed it. Also I feel like I I probably wasn't supposed to resort to *-1 to make it work. So Id also like feedback on my solution. Tell me why it's bad.

Answer 1

#include <iostream>
using namespace std;

int main() {

int person, bus;
cin >> person;
bus =50- person %50 ;
cout << bus;

return 0;
}

//I think so by seeing this code 👆. You will be comfortable with the logic and don't define variables which you don't use

Answer 2

Yes it's working

Answer 3

Oh so I was close the first time! I originally had chair %50 - person. I just had to move the %50. Thanks!