Nan or -1 (test 5) for non clue cells ?
Thanks for the catch. I've updated that test case.
Now, the biggie. Implement a solver for advanced FAP. I never managed to create one that worked on all problems.
I was working on it last night, but it's tabled for now. I can't quite figure out how to solve the advanced logic portion that propagates along adjacent clues (including diagonal) to solve cells outside of that clue's reach.
Good problem but too difficult for a first contact. Maybe a first basic problem with small boards and/or clear cues (0/9). And after only, a more difficult one.
If anyone is interested more in these games, I've made quite a few of them on Sporcle.com. for the first of four Fill-a-pix (aka, mosaic logic puzzle) playlists.
Remove the polynomials that have positive real elements of their roots.
First N Perfect Squares
Number of 1s in a binary string
sum of non-primes
Beginner's Problem - Squaring
Fill-a-pix - Solution Checker
Divisible by n, prime divisors - 11, 13, 17, & 19
Evened up (or not)
Divisible by 12
Lights Out 6 - 5x5, 13 moves
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