I think the description needs a small fix, it says "...and every cell only contains integers from 0 to 9", but the integers are actually from 1 to 9.

No biggie, fixed my solution, now that I know that that kind of thing can happen when rendering test results I'll know how to interpret the output next time and won't waste time on the wrong thing.

Hey

I found the error, just the test output was a bit misleading. The multiline test name was rendered a bit weirdly and the copy of the test input was missing first row, which lead to me testing with ilformed matrix which caused the test to work locally, but invalidating the input for different reason. The real reason was wrongly formed sub matrices.

Also the log of the test included stuff from the following test.