application/octet-stream
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2.86 KB
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90 lines
#!/usr/bin/env nujel
[defun fold/load [filename]
[def points #nil]
[def γ [reduce [\ [α β]
[cond [[zero? [string/length β]] α]
[[== [char-at β 0] #\f]
[tree/set! α :folds [cons [split [caddr [split β " "]] "="] [α :folds]]]]
[#t [def τ [map read/single [split β ","]]]
[set! points [cons τ points]]
[tree/set! α :width [max [α :width] [+ 1 [car τ]]]]
[tree/set! α :height [max [α :height] [+ 1 [cadr τ]]]]]]]
[split [file/read filename] "\n"]
@[:width 0 :height 0 :folds #nil]]]
[tree/set! γ :data [-> [array/allocate [* [γ :width] [γ :height]]] [array/fill! 0]]]
[while points
[array/set! [γ :data] [+ [caar points] [* [γ :width] [cadar points]]] 1]
[cdr! points]
]
[tree/set! γ :folds [reverse [γ :folds]]]
]
[defun fold-y [data y]
[def ret [array/2d/allocate [data :width] [/ [data :height] 2]]]
[def dh [data :height]]
[def rw [ret :width]]
[def rh [ret :height]]
[for [y 0 rh]
[for [x 0 rw]
[array/2d/set! ret x y [+ [array/2d/ref data x y]
[array/2d/ref data x [- dh y 1]]]]
]]
[tree/set! ret :folds [cdr [data :folds]]]
]
[defun fold-x [data y]
[def ret [array/2d/allocate [/ [data :width] 2] [data :height]]]
[def dw [data :width]]
[def rw [ret :width]]
[def rh [ret :height]]
[for [y 0 rh]
[for [x 0 rw]
[array/2d/set! ret x y [+ [array/2d/ref data x y]
[array/2d/ref data [- dw x 1] y]]]
]]
[tree/set! ret :folds [cdr [data :folds]]]
]
[defun do-fold [α]
[if [== [caar [α :folds]] "x"]
[fold-x α [cadr [α :folds]]]
[fold-y α [cadr [α :folds]]]]
]
[defun do-all-folds [α]
[while [α :folds]
[set! α [do-fold α]]
]
α
]
[defun dot-count [α]
[def β [α :data]]
[def len [array/length β]]
[def ret 0]
[for [i 0 len]
[when [> [β i] 0] [++ ret]]
]
ret
]
[defun print-folded [α]
[for [y 0 [α :height]]
[for [x 0 [α :width]]
[if [zero? [array/2d/ref α x y]]
[display "."]
[display "#"]]
][newline]]
]
[def res-p1 [dot-count [do-fold [fold/load "tests-full/day13.input"]]]]
[def final-map [do-all-folds [fold/load "tests-full/day13.input"]]]
[def res-p2 [dot-count final-map]]
[when [!= res-p1 842]
[throw [list :wrong-result "Wrong result" res-p1]]]
[when [!= res-p2 95]
[throw [list :wrong-result "Wrong result" res-p2]]]
