application/octet-stream
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4.25 KB
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138 lines
#!/usr/bin/env nujel
[def lines [split [file/read "tests/day8.input"] "\n"]]
[def counts [-> [array/allocate 10] [array/fill! 0]]]
[defun output/count [entry]
[def len [string/length entry]]
[case len
[[2] [array/++ counts 1]]
[[3] [array/++ counts 7]]
[[4] [array/++ counts 4]]
[[7] [array/++ counts 8]]
[otherwise #f]
]
]
[defun find/by-length [vals arr len pos]
[if vals
[if [== len [popcount [car vals]]]
[do [array/set! arr pos [car vals]]
[find/by-length [cdr vals] arr len pos]]
[cons [car vals]
[find/by-length [cdr vals] arr len pos]]]
#nil]
]
[defun find/six [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 6]]]
[filter [\ [α] [== [popcount [logand α [numbers 1]]] 1]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 6 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun find/five [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 5]]]
[filter [\ [α] [== α [logand α [numbers 6]]]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 5 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun find/nine [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 6]]]
[filter [\ [α] [== α [logior α [numbers 4]]]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 9 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun find/zero [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 6]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 0 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun find/three [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 5]]]
[filter [\ [α] [== α [logior α [numbers 1]]]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 3 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun find/two [vals numbers]
[def ret [->> vals
[filter [\ [α] [== [popcount α] 5]]]
[filter [\ [α] [!= α [logior α [numbers 1]]]]]
]]
[when [> [length ret] 1] [stacktrace]]
[array/set! numbers 2 [car ret]]
[filter [\ [α] [!= α [car ret]]] vals]
]
[defun seven-seg->binary [str]
[reduce [\ [α β] [logior α [case β
[["a"] #x01]
[["b"] #x02]
[["c"] #x04]
[["d"] #x08]
[["e"] #x10]
[["f"] #x20]
[["g"] #x40]
]]] [split str ""]]
]
[defun translate [vals out-vals]
[def numbers [-> [array/allocate 10]
[array/fill! #nil]]]
[-> [map seven-seg->binary vals]
[find/by-length numbers 2 1]
[find/by-length numbers 3 7]
[find/by-length numbers 4 4]
[find/by-length numbers 7 8]
[find/six numbers]
[find/five numbers]
[find/nine numbers]
[find/zero numbers]
[find/three numbers]
[find/two numbers]]
[defun translate/val [val i]
[when-not i [def i 0]]
[when [> i 10] [throw [list :error ""]]]
[if [== [numbers i] val]
i
[translate/val val [+ 1 i]]]
]
[reduce [\ [α β] [+ [* α 10] β]] [map translate/val [map seven-seg->binary out-vals]] 0]
]
[def part-2 [reduce [\ [Σ line]
[def split-args [split line "|"]]
[def output-raw [map string [read [cadr split-args]]]]
[for-each output/count output-raw]
[def table-raw [map string [read [car split-args]]]]
[def output-sum [translate table-raw output-raw]]
[+ Σ output-sum]
] lines 0]]
[def result [sum counts]]
[when [!= result 532]
[throw [list :wrong-result "Wrong result" result]]]
[def result part-2]
[when [!= result 1011284]
[throw [list :wrong-result "Wrong result" result]]]
