application/octet-stream
•
1.24 KB
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50 lines
#!/usr/bin/env nujel
[defun array/2d/new [width height val]
[def ret [array/allocate width]]
[def x 0]
[while [< x width]
[array/set! ret x [array/fill! [array/allocate height] val]]
[++ x]
]
ret
]
[defun parse/point [text]
[tree/zip '[:x :y] [map read/single [split text ","]]]
]
[defun line/dir [start end]
[cond [[== start end] 0]
[[< start end] 1]
[#t -1]]
]
[defun line/draw [x y end-x end-y]
[def dir-x [line/dir x end-x]]
[def dir-y [line/dir y end-y]]
[while [or [!= x end-x] [!= y end-y]]
[array/++ [vents x] y 1]
[+= x dir-x]
[+= y dir-y]
]
[array/++ [vents x] y 1]
]
[defun line/draw-vents [line]
[line/draw [[line :a] :x] [[line :a] :y] [[line :b] :x] [[line :b] :y]]
]
[defun points/count [v num]
[reduce [\ [a b] [+ a [reduce [\ [a b] [+ a [if [> b num] 1 0]]] b 0]]] v 0]
]
[defun parse/line [line]
[line/draw-vents [tree/zip '[:b :a] [map parse/point [split line "->"]]]]
]
[def vents [array/2d/new 1000 1000 0]]
[def lines [split [file/read "day5.input"] "\n"]]
[for-each parse/line lines]
[when [!= [points/count vents 1] 21305]
[throw [list :wrong-result "Wrong result" result]]]
