application/octet-stream
•
2.72 KB
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99 lines
#!/usr/bin/env nujel
[def flashes/get]
[def flashes/inc!]
[let [[flashes/counter 0]]
[set! flashes/get [\ [] flashes/counter]]
[set! flashes/inc! [\ [] [++ flashes/counter]]]
]
[def p1-res 0]
[def p2-res 0]
[defun map/set/row [data y line w]
[def cols [map int [split line ""]]]
[for [x 0 w]
[array/2d/set! data x y [car cols]]
[cdr! cols]
]
]
[defun map/load [filename w h]
[def ret [array/2d/allocate w h]]
[def lines [split [file/read filename] "\n"]]
[for [y 0 h]
[map/set/row ret y [car lines] w]
[cdr! lines]
]
ret
]
[defun step/increase-energy [α β]
[for [x 0 [α :width]]
[for [y 0 [α :height]]
[array/2d/set! β x y [+ 1 [array/2d/ref α x y]]]
]]
]
[defun step/flash-increase [β flash-map x y]
[when [and [== #f [array/2d/ref flash-map x y]]
[>= x 0]
[>= y 0]
[< x [β :width]]
[< y [β :height]]]
[array/2d/set! β x y [+ 1 [array/2d/ref β x y]]]
[step/flash-try β flash-map x y]
]
]
[defun step/flash-try [β flash-map x y]
[when-not [array/2d/ref flash-map x y]
[when [> [array/2d/ref β x y] 9]
[array/2d/set! β x y 0]
[array/2d/set! flash-map x y #t]
[flashes/inc!]
[for [cx [- x 1] [+ x 2]]
[for [cy [- y 1] [+ y 2]]
[step/flash-increase β flash-map cx cy]
]
]
]]
]
[defun step/flash [β]
[def flash-map [array/2d/allocate [β :width] [β :height]]]
[array/fill! [flash-map :data] #f]
[for [x 0 [β :width]]
[for [y 0 [β :height]]
[step/flash-try β flash-map x y]
]
]
]
[defun step [α]
[def β [array/2d/allocate [α :width] [α :height]]]
[step/increase-energy α β]
[step/flash β]
β
]
[defun step/do-many [α steps]
[for [i 0 steps]
[if [== i 100] [set! p1-res [flashes/get]]]
[def pre-flashes [flashes/get]]
[set! α [step α]]
[when [== 100 [- [flashes/get] pre-flashes]]
[set! p2-res [+ 1 i]]
[throw [list :all-flashes]]
]
]
α
]
[def state [map/load "day11.input" 10 10]]
[try [\ [ε] [when [!= [car ε] :all-flashes] [throw ε]]]
[def ret [step/do-many state 1000]]
]
[when [!= p1-res 1694]
[throw [list :wrong-result "Wrong result" p1-res]]]
[when [!= p2-res 346]
[throw [list :wrong-result "Wrong result" p2-res]]]
