# HG changeset patch # User Steve Losh # Date 1639015232 28800 # Node ID 0b68f84e44aeea6ca11999617cca3a260bcf9336 # Parent b8ca529c922899d73e71a4780f2eef8c8a820b2b 2021/08 and 2020/13/1 diff -r b8ca529c9228 -r 0b68f84e44ae data/2020/13.txt --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/data/2020/13.txt Wed Dec 08 18:00:32 2021 -0800 @@ -0,0 +1,2 @@ +1000001 +29,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,41,x,x,x,x,x,x,x,x,x,577,x,x,x,x,x,x,x,x,x,x,x,x,13,17,x,x,x,x,19,x,x,x,23,x,x,x,x,x,x,x,601,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,37 diff -r b8ca529c9228 -r 0b68f84e44ae data/2021/08.txt --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/data/2021/08.txt Wed Dec 08 18:00:32 2021 -0800 @@ -0,0 +1,200 @@ +dfgabce cadfgb cefa ca aecbg dfcegb geabd ecbfg cab agcfbe | egbfadc dbgae gcfeb abgdfc +fbcag eg dbge gcbfe acdgfe gec fdcegba efbdc fbedgc efabdc | ge fagbc dfebc eg +da gdbcea gdcfbe acgbd dbfcgea ebad aecdfg afcbg adc ecdbg | afcegd dacebg ad cdbafeg 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gadebf cdabfe badcf agd fcdbega | abdfeg gd egbac cabgdf +dfgebc eabcd efcdb dbecfa dac aegdb ca bcgafed fbac fcadge | ca egcdafb afcbdge eagdb +ebgdc cbgdfe dcbfae bfagcd gdef cebga bceagfd ecd dfbgc ed | de ed fdegcba edc +eb feb begdcf efgacb gdbe daecf dgcfb fbdcega cebfd gabcdf | efdbc be afdec efb +begac fbec bcdafg acb cb fgaebd afegbc gebadcf dagec beafg | adgce fceb cgdeafb cab +ca cdfagb ebfca ebdcgaf afebg dfbgae cega cebfd fbagce fac | bgedaf cgae gdaecfb egdabcf +gabfd agfc ecdbfag aefcbd afd af gdabfc bgcfed abedg dcgfb | af bdgcef adgbf gcdafb +egfda fed dbfga adgefb de gacbdf aefgc aecbfd bdge fdbecga | ed de eacbgdf bdeg +dbfag cdbfea gfdbec agfedbc gfb bg gabfcd fgeda dbfac acbg | dfbac gcba gb fbgda +dbcgf gba gdcaeb dgbacfe edfba debgcf cbdgaf afcg ag abfdg | bgafecd edfcgb ag dgfba +bdfcg acebfg egfbacd gfdcba fbg dagb bg cbdaf cgdfe edfcab | bagd gfebacd efbcda gfb +cedbf fcabdge cge feagbc dfcge gedb adcgf bdcefg edacfb eg | cbdfe cge efbcad cfagdeb +cga fgeda ceagd ebcg beadc bgfecad fgdcba gc cagebd dfeabc | cag daebgc cg fcdageb +fgdc fda aebgd cabfde fd agbecf fdacgbe dbfga cfgba bdgacf | facbg fbdagec fdcg ebafcgd +gbced efbgca gfebd bdc baecg fcabed dcbgeaf gbedac dc acdg | gfbace cdafbe cbaeg bcd +afgdec ba dbcge daefg dabeg dfbcage afbd fgdaeb gab cfegab | bcfage bgead ba fgdbcea +ace dgcaef daegbc bfgeda ecbd degab cgabf ce eagbdfc bcgea | cdgeaf bdgea edcb cae +cd cadf gfead gdefab dce adcfge degcf cgefb gdfbcae aebcgd | efgdc dce ecd dc +afdbe ad fgdeb fda aebdcgf bcaefg acbfe fdceab bacd dcagef | afd begfd acfeb fda +dfg afgedbc cbfga gbdace dbagf fdegab edgacf df befd edgba | dgeba df efbd cfadge +bdcgaf aebg badfce efagc gdefc cabfeg abgcf ecafbdg afe ae | aegdbcf ageb eagb ebdfgca +gdceab fb bfe cgbfea edbagfc cafed ebacg ebafc defgcb gbfa | efb efcba bf afgb +bafcg cdfgb ac caf fcdabe adgc dbgefc bedafcg bgacdf bfaeg | bcfegad afegb gabfdce bgcfa +dafgb gca fcab fcabgd dcfaebg gfcdae cgdba ac gbadef egcbd | bcedg aebgfcd gfeadb afbc +adebg fcgaedb dagfe agfc fdbaec fgaecd feg acdfe gf becdgf | feg fge gfe egf +gf gfda gfb gfcebd gefab afcbged eabdg adgbfe fbace bgcade | dbafgce fbdaeg dagf fcbae +fbegcd ecg cefdbag fcgd ebdac gbecd cg bfcgea bafdeg edfgb | fcbegd acbde bcgaef cge +gbcadf cf gfbc defbca acgfd bcaedg afegd cfbgeda caf gcdba | begcad cfa bagfedc gbcdeaf +begacdf dcafbg gb cgfbed gbcde cedfab dfcbe gbc cadge ebfg | gbfe gb ebcdfga bfeg +fe bgadefc cbgdf gbfade cefgd ecdgaf efg afce eacgd dcgeab | gdebac fcae egbdfac fgdeab +ebfca fdac fdb bgdecaf dbcgef cedbfa bgcefa fd eadfb baegd | cgfaeb dgbecf dfb bagecf +ebda eagcf gcbea ba bfcegad acebgd gdecb cdafgb acb gfcdbe | fgcebd cedbgf gbfdac cefag +edacf fed eacgd febadc ebafc bfcgea ecafgdb adbf fd gbfdec | fabce egfcbd deafgbc bafd +gfbe fdbga ged ge aegdf baegcd afecd ebgcfda fgacbd gdeafb | cdfae fdaec ge aefdg +gebaf afdbcg cfged dga fgead febdcga ad fbaedg bade gbfaec | cgbfdea gadfecb agfde gad +fdg cfgdbe cfbeadg cgbf gedbc dcfage dfgeb fg agcbed adefb | gdf bdecg faedb gfd +acdgbe cfabg gfbacd cbf dfbcea bcfegad cf gcdab efbag fdcg | dbfagc fgbdcea cbdga fc +afbcg dgbfac dgaebf gcfea gbceadf afb fb abgcd abcdge fdcb | gbceda cgdabe bcgdae fbgdea +cgbedf dbgfc cbef cf bgfda gcedb gadceb efdcag fdc bcfdaeg | fecb ebdcfg cf badgf +fg cafdg fegadbc aefcdb bcagd degf gfecba adegfc cfg fdeac | gdcafe cgfdae gebfca dfcgae +fdbecg fcagbd fgeabd cadbe bcdag dafgb facg gdc bdgeacf cg | cedab cbdga gcd gc +gdeaf edbcag fbac fgecdba dfbcea afdce ac fbecd dbefcg cea | efcbd gdeaf dfceagb ace +abgdc ebcgd ecgdf ebagcd dabe edgbcfa be cgeabf ceb cdfgba | fdacbg abegcd abdgc cabfdge +fbgcd feacb ed eadf becfd bde fdabce cgdbea fadbcge gbefac | dcgbf fcebd ebcfd gbface diff -r b8ca529c9228 -r 0b68f84e44ae src/2020/days/day-13.lisp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/2020/days/day-13.lisp Wed Dec 08 18:00:32 2021 -0800 @@ -0,0 +1,21 @@ +(advent:defpackage* :advent/2020/13) +(in-package :advent/2020/13) + +(defun parse (stream) + (cons (parse-integer (read-line stream)) + (_ (read-line stream) + (str:split "," _) + (remove "x" _ :test #'string=) + (mapcar #'parse-integer _)))) + +(defun part1 (n buses) + (iterate (for b :in buses) + (for wait = (- (mod n (- b)))) + (finding (* b wait) :minimizing wait))) + +(define-problem (2020 13) (data parse) (174) + (destructuring-bind (n . buses) data + (values (part1 n buses)))) + + +#; Scratch -------------------------------------------------------------------- diff -r b8ca529c9228 -r 0b68f84e44ae src/2021/days/day-08.lisp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/2021/days/day-08.lisp Wed Dec 08 18:00:32 2021 -0800 @@ -0,0 +1,93 @@ +(advent:defpackage* :advent/2021/08 + (:import-from :alexandria :length= :set-equal)) + +(in-package :advent/2021/08) + +;; 0 . a b c e f g 6 +;; 1 . c f 2 +;; 2 . a c d e g 5 +;; 3 . a c d f g 5 +;; 4 . b c d f 4 +;; 5 . a b d f g 5 +;; 6 . a b d e f g 6 +;; 7 . a c f 3 +;; 8 . a b c d e f g 7 +;; 9 . a b c d f g 6 + +(defun parse (stream) + (iterate + (for line :in-stream stream :using #'read-line) + (for words = (mapcar (rcurry #'coerce 'list) (str:split " " line))) + (collect (split-sequence:split-sequence '(#\|) words :test #'equal)))) + +(defun input (entry) (first entry)) +(defun output (entry) (second entry)) + +(defun uniquep (word) + (member (length word) '(2 3 4 7))) + +(defun supersetp (sup sub) + (and (subsetp sub sup) + (null (set-difference sub sup)))) + +(defun common-element (&rest sets) + (let ((result (reduce #'intersection sets))) + (assert (length= 1 result) () "No common element in ~S." sets) + (first result))) + +(defun solve-entry (entry) + (let ((words (remove-duplicates (append (input entry) (output entry)) + :test #'set-equal)) + (solved (list))) ; alist of e.g. (1 . (#\a #\b)) + (flet ((solve (n predicate) + (let ((result (find-if predicate words))) + (alexandria:deletef words result :test #'set-equal) + (push (cons n result) solved)))) + ;; * 1, 4, 7, 8 have unique lengths. + (solve 1 (curry #'length= 2)) + (solve 4 (curry #'length= 4)) + (solve 7 (curry #'length= 3)) + (solve 8 (curry #'length= 7)) + ;; * 9 is a superset of 4. + (solve 9 (rcurry #'supersetp (assocdr 4 solved))) + ;; * 0 is the 6-element superset of 7. + (solve 0 (lambda (word) (and (supersetp word (assocdr 7 solved)) (length= 6 word)))) + ;; * 3 is the 5-element superset of 7. + (solve 3 (lambda (word) (and (supersetp word (assocdr 7 solved)) (length= 5 word)))) + ;; * 6 is the only 6-element group left. + (solve 6 (curry #'length= 6)) + ;; * 5 contains the only element all the solved so far have in common. + (solve 5 (lambda (word) + (member (apply #'common-element (mapcar #'cdr solved)) + word))) + ;; * 2 is the last one left. + (solve 2 (constantly t)) + ;; Return the result. + (digits->number + (loop :for o :in (output entry) + :collect (rassocar o solved :test #'set-equal)))))) + +(defun part1 (entries) + (iterate (for entry :in entries) + (summing (count-if #'uniquep (output entry))))) + +(defun part2 (entries) + (summation entries :key #'solve-entry)) + +(define-problem (2021 8) (data parse) (440 1046281) + (values (part1 data) + (part2 data))) + + +#; Scratch -------------------------------------------------------------------- +(solve-entry + '(((#\a #\b #\c #\e #\f #\g) + (#\c #\f) + (#\a #\c #\d #\e #\g) + (#\a #\c #\d #\f #\g) + (#\b #\c #\d #\f) + (#\a #\b #\d #\f #\g) + (#\a #\b #\d #\e #\f #\g) + (#\a #\c #\f)) + ((#\a #\b #\c #\d #\e #\f #\g) + (#\a #\b #\c #\d #\f #\g))))