Reply To: Challenge 10B
I had initially thought it was a 36×16 grid with a pair of letters in each square rather than a variation of the four square cipher, if my hill climbing program had been better the 36×16 grid idea should still have solved it on day 2 (with lots of repeats in the grid). Now I’m back from my break and had a chance to have another look at it I’ll have to see if I can improve my code to also get the solution from using the 36×16 grid because even though there are far more options (576 factorial) it should still be possible. I’m currently using quadgrams to test to see how ‘English’ the result is in my hill climbing algorithm, I gather using the index of coincidence (IOC) maybe better (or possibly a combination of the two might be the way to go).