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your code is very small and still work fine,
will you explain me how [(i+n-d)%n] is working here. please
actually why you are using % here thats making me confuse

% (modulus) gives you the remainder of division.so 4%5=4,5%5=0 likewise 6%5=1, it helps you to stay inside the limit i.e lesser than the value n (i.e till n-1) eg:if n=5 it goes from 0 to 4.try this simple mod in calc or put it in a loop you will understand.we are getting the input value to the rotated index thats why (-d).if right rotation +d.

## Left Rotation

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your code is very small and still work fine, will you explain me how [(i+n-d)%n] is working here. please actually why you are using % here thats making me confuse

% (modulus) gives you the remainder of division.so 4%5=4,5%5=0 likewise 6%5=1, it helps you to stay inside the limit i.e lesser than the value n (i.e till n-1) eg:if n=5 it goes from 0 to 4.try this simple mod in calc or put it in a loop you will understand.we are getting the input value to the rotated index thats why (-d).if right rotation +d.

It's a great solution but how would someone come up with the idea to use a modulus in this case?