Stuff
public text v1 · immutablequeens 0 = [[]]
queens (n+1) = [ q:b | b <- queens n; q <- [0..7]; safe q b ]
safe q b = and [ not checks q b i | i <- [0..(b-1)] ]
checks q b i = q=b!!i || abs(q - b!!i)=i+1queens 0 = [[]]
queens (n+1) = [ q:b | b <- queens n; q <- [0..7]; safe q b ]
safe q b = and [ not checks q b i | i <- [0..(b-1)] ]
checks q b i = q=b!!i || abs(q - b!!i)=i+1