l:eval[read["../../lib.lil"]].vars
i:"\n" split -1 drop read["../inp/23"]

chk:"%j" parse "[[[-1,-1],[-1,0],[-1,1]],
  [[1,-1],[1,0],[1,1]],
  [[-1,-1],[0,-1],[1,-1]],
  [[-1,1],[0,1],[1,1]]
]"
pd:"%j" parse "[[-1,0],[1,0],[0,-1],[0,1]]"
nbs:l.uniq[raze chk]

on pa x y do
  each z in y x+z end
end
# on idx x y do
#   each z in y x[z[0]][z[1]] end
# end
on plt pts do
  g:(1+max pts.[0]) take list (1+max pts.[1]) take "."
  # show[g]
  each x in pts
    g[x[0]][x[1]]:"#"
  end
  each x in g print[x] end
  print["---"]
end


pts:()
each r in range i
  each c in range i[0]
    if i[r][c]="#"
      pts:pts,list r,c
    end
  end
end
# show[pts]
ppts:()
niters:0
while !ppts~pts
# each _ in range 10
  if niters=10
    wh:1+(max pts)-min pts
    print["Part 1: %i" format (wh[0]*wh[1])-count pts]
  end
  ppts:pts
  d:() dict ()
  ptst:()
  each x in pts
    if pts take pa[x nbs]
      chi:0
      while chi<count chk
        if 0=count pts take pa[x chk[chi]]
          np:x+pd[chi]
          d[np]:(() unless d[np]),list x
          chi:9999
        end
        chi:chi+1
      end
      if !chi=10000
        ptst:ptst,list x
      end
    else 
      ptst:ptst,list x
    end
  end
  chk:(1 drop chk),1 take chk
  pd:(1 drop pd),1 take pd

  each val key in d
    if 1=count val
      ptst:ptst,list key
    else
      ptst:ptst,val
    end
  end
  pts:ptst
  show[niters]
  0
  niters:niters+1
end

print["Part 2: %i" format niters]