Day 4: 491

d4golf.hs

@@ -0,0 +1,22 @@
+import Data.Either
+m=map
+z=zipWith
+r=pure
+l=Left
+i=isRight
+c=isLeft
+e=[]:e
+s[]=[]
+s(v:t)|'.'>v=' ':s t|let=v:s t
+v[]=[]
+v s=tail(take 6 s):v(drop 6 s)
+d%i|i==l d=r d|let=i
+a=m.m.m.(%)
+h=any$all i
+x!d|h d||h(foldr(z(:))e d)=r$(x*)$sum$lefts=<<d|let=l 0
+(x:y)#f=m(x!)(a x f):y#a x f
+a?b|c a,i b=b|let=l 0
+q i=(\(a:b:_)->z(?)a b)$drop(length(takeWhile(any c)i)-1)i
+w p(n,t)=head$rights$p(n#t)
+p(x:y)=(m read$words$s x,v$m(m(l.read).words)y)
+main=interact$show.((,).w q<*>w(filter i=<<)).p.lines