Another one! I wasn't given a Sudoku solver to do as part of a class (I trained in engineering), but have done one recently simply because it's really interesting. Pretty sure this one is efficient (github.com/rantydave/sudoku), took a lot longer than a couple of hours :)
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.