If the error message is 0 should equal 9 neither of those is the input, the first one is what your function wrongly returned, the other the expected value, to know what the input is, print it, read this: https://docs.codewars.com/training/troubleshooting#print-input

There might be a mistake in your own observation as well. Don't rule that out, because that's the most likely cause. Where and how does it say this?

Hi, you need to use a spoiler tag when posting code, (I have addedthe tage to your comment).

Hi. A few things: use a spoiler flag when posting elements of solutions, or anyone who has not solved this kata will be able to see your code (and maybe you give the solution with only a little typo). Then please say clearly which language you're using when asking for help, I guess it's C. Also, please use markdown tags to format your code or it's very discomfortable to read, see: how-to-format-code-in-markdown. The code you're giving is syntactically incorrect since nsizeof(int) throws an error (I guess it is in fact n, sizeof(int) ? We should not have to guess what you're doing, and try to rewrite your code for you, so please provide exactly a code you're using with the corresponding error). Invalid memory access means you probably try to access some element out of bounds of an array, but I can't tell more (I think there are several other problems with your code; I would advice to try to write a cleaner code with single loops and no gotos, but I may be wrong).