hacker.org

I'm using a Gauss-Jordan style elimination in python, with NumPy arrays of bool types. It's not very quick :P I'll probably move over to C soon, and then look into cache-friendly blocking stuff for the elimination, although the way this is scaling I don't expect that to be enough to get through to t...

Update: Made an answer validation routine - it said my answer was correct. So, to check that I wasn't going mad, I entered it by hand. Thankfully level 91 is only 23x23 so it didn't take too long! Anyway, having submitted my answer manually, i've now moved on to level 92. This is doing the same thin...

Ok, thanks. I guess it's time to write an answer checker, and try to work out how it got this one wrong!

My new solver was just running through Crossflip and has gotten stuck at level 91. I have a solution (529 characters long), but when I submit it, instead of getting back the page for level 92, I get level 91 again :( If I try to warp to level 92 it tells me I can't, which suggests that my solution h...