is a string with non numeric character.

hmmm... yeah, I guess there must be one, but the sensible limit kicks in long before the technical limit does. Take a step back and rethink your approach; you don't need a big array to solve this one.

Fixed, thanks for your feed and see if anything else happens again :)

I believe this is actually an issue with the test cases themselves, as some people have pointed out already.
The test case in question uses the parameters [1, 7] and [1, 8], which should return 0 but the test case wrongly expects 1.