using modulus at the index: i%n is a good idea!

somehow brute force but nice solution

Although not a good idea, this is the only recursive solution :)

single + at left of variable converts it to integer!

I understand what this is: res + +cur
But what kind of syntax is that I didnt understand??

yes if there is a more than one space I think there might be a problem

I have seen such usage of Boolean for the first tme