day 8

input/2021/day8-sample1.txt

@@ -0,0 +1 @@
+acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab | cdfeb fcadb cdfeb cdbaf

input/2021/day8-sample2.txt

@@ -0,0 +1,10 @@
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce

input/2021/day8.txt

@@ -0,0 +1,200 @@
+febca cfagb ecbafd efdcbg cbegdfa fg bgafec gfae acgdb gfc | cgf facdeb ecgfdb afcbge
+acbed dcagb cfbega ecgdab be deafc bfgdca abe edafgbc debg | dceab dgbca gedabc fecabgd
+decfb bgadec dgefa bcgfade cae adecf ca eacfdb bcaf dfgbec | bfca fdacbge cedfb dfebac
+egd agdcfe gedbfa gbcfae ed dafgebc bdcgf gdbfe fgabe dbae | cefbga egfcba dbfeg ed
+bfeca beadgc gdfeacb aebcfd eg aefg cgefab ebgfc gbdfc beg | bedacf eg dabegc bfeac
+fcd fd fgdceba edgac cegdbf gcafdb agdfc cafbg beagfc dfab | dacbfg gfacb fcd fd
+cfbgeda gdfae abdfg dfceg edagfb geba bfcaed fcdbag ae aef | dcbefa dagfb dcefg abgdef
+edafbg ebg gbdea cdbefga bfgcea ge egdf aedcb gfadb gbcfda | degbaf dbgafe ecdab dagbf
+adecfb aebdc ab efbagd cfbed cagde baecgfd egdbfc bad bcaf | cbaf beadfgc febcd gaecd
+gfdacb bgdace gb cdfbg fcbde fdgeac bgfa dgb acfgd bdcefag | bg dbegac fbdegac agfb
+bfdace bdcfa ebcag egcdbfa dbg dg fbegdc bcgda fgabdc gfad | cadgb abcdg eagbc dagf
+bed faegcb fedcba dgbcea feabc cdefb bd bcdfgea edgcf afdb | dgcfe adfebgc ebgcad cfebd
+cfead dc dagef gfdc cgdefa acdbeg cad egfabcd bgeafd aecfb | dafge fdgeba faecd cbaef
+afgbde gebca ecbdaf caedb faceg abgcedf cdbeag cbdg bg agb | bg bcaed aecgb cgbae
+dfab dfgae bcafge cbefagd fdbeg fa fea fcbdge aegcd bdeagf | gfaedb af acbgfe faecgb
+decafg cadef fadecb dfeba aecbgd gefbd aeb ba ebfgdca abfc | gbfaedc bdefg acbf gcafde
+efgbd efdacg cd gefcd becagf dgc edca egdbafc cegfa fgdbca | eacgf bgafcd bfaegc dc
+gabed gdacfe egabcdf cdaf fdg acgfe fgdea gafbce degbcf df | fcaeg cefag bfegdc dfg
+gd badgcf cdg gbdcae cbdea dgfceba bfadec gdbe geadc acefg | gdc ebdg dg aegcf
+gbae fedcag bg ecgbda bfecd dcage fecgbda bgdce acfdgb gbd | cbgafd edcfb dbg bedcg
+abcgdf cfgae cebag gedbafc dcgbae abg decfbg gcebd ab dabe | gdbeac ab ab dcfbga
+gab efgbd gbcfad edgfac ba gaced dgcbae edbag fcgedab aecb | gfdace adebg ba cgbdfa
+acebg aedbfg deca ad dcaebg cgfbd abd cdabg dbecgfa agfceb | ad fadegb dcae cbfgd
+fdagcbe ebgdac ecfgbd fbc fc cbged fbegc cdef cfdgba agbfe | bfgce begcf cdfe cbf
+cbd fadgb dceag cb gfadeb begfcd cafb cgfdba gbadc cegdbaf | bdc bc adcbfeg dgace
+bgdefca cbgadf ebacf dfbac gedcfa cef fe gcbae fbed fcdbae | fe cadbfe ebfgacd cdbafg
+acfde cgeabd cag gfcb adgfc fdgbae fbdag cgefabd dgbacf cg | fgadc dcbgae ebdagf gbacfed
+ebdcg cfdbage cefbag cb ecb dabc cagdeb gbefd afdcge adegc | dgbafec dcfgea dgbef aecdg
+acd bfcged aedgfcb afdbce efcdb cfdae cbae cdafgb gdefa ac | aceb ecbgfad bdaefc efbcd
+cebd aefdgcb bafecg bfagd adfecg dcgab gcd cd ebcadg cebag | cdg cdg gcdba dafgec
+aecgbf bgfae gbcfeda fba abce gebfcd ab gcebf gcdfab gdafe | begcf baf baf fbgcae
+acdgfb bgedfa cbadfe degf gbeac gd adg dbgcaef abged febda | dg dg ebdfca fgacbd
+cfb fbdgac gcdaefb dabec fbcda fagbd cf cdgf bacfge ebfagd | bcdae bgdeafc acegbdf cf
+caegdb acgbf abdcgf fgebd afcd cd ecafgbd gcbdf dgc fbgace | acfbg efacdbg bcfgd fbcgad
+eab fecbdg dcfab fdcgaeb gdebc cegadb bcaed bfgace ea aegd | ea bfadc bcgdae becfag
+cg fdbeg eafcb bcefda cabfdeg cbfgae bfecg bagc gec dfgaec | bagc ecg cg abcg
+ceafg dgeab ecd fcbedg edcgfa agdbfce dafc bcfage agcde cd | ecdga gecad cdaegf dafc
+gedcf bcad abcfgd bd dcfbg bfgac fecgab bfd efgdcba faedbg | bd bd dacb cfgbd
+dcgfab fabed decbf gebcdf da efbag deca acfbegd dba fadcbe | ad abgef efdba debfc
+gadcfe gefdbc faced cfa geac afcgbd efbacgd ac cgdfe baedf | ca afc fcegd gedfca
+gefca ecdagb bg ebadf dbfg eagbf fbegdca cefbda beg fbedga | gb fabge gaebf ecbdag
+abd gdecbf da ecfbd afgbde ceda abdcf dfbcgae dbacef facbg | dafcb bda dgaebf gfabc
+afbegc cdgea aedfbg cgdb bgcaed egcdbfa cfeda cg dagbe gec | agedfb fabdge fegbda ecg
+ac acdbge dgbefa abc dbecfa cabgefd fegbc fbace eadfb fdac | ecbaf ca cgebadf afcd
+fdgcb cebf dcfbge cbdag gdbef acgdfe adgbecf fgc badfeg fc | ebcdgf cfg bgdac gfdeab
+gefc ecadgb efcabdg fca ecgad fc ceadgf bdfacg afebd cdaef | fca bgdeca efbad cf
+gcbfd ecdbf cfdgab gacfb dg gbda efcgba gfd egdcaf ebcadfg | gd gbacf facgb fcbed
+ecfa edfgcb bgdae abcdef ac debfc cad acbed febdgca bfcgad | edabc ca acd eadbc
+dbceaf cbagfe bdcgae bdc cdag debgf abcge bdgcaef dc cdebg | bdface gadc bgaec cebgaf
+ecf dfbae aecbf gabcf bfgdca cbegfd ec gcea cebfag cedabfg | afdeb efbca dbfea afbcdg
+bdagcfe gd debgca dgfc gbaef adbfce fcdbga gad dabcf fbagd | gdbeca dga cdbafg deabfc
+egabfc fdeb dcbae cfdea aeb be dabgc abcdef cagedf fegbacd | bdfe cedfag edbf gaefcd
+decfgba efgdc befdc dcabf ebc gbacdf acgbfe abedfc be deba | fdebc bec eabd fdagceb
+efbag gdae dgcbaef cdfbge gbfed gdcabf fedgba bag ag acebf | gbedf bafdcg cabdfg dgcfaeb
+dcfb agcdb aedfcg gfbdae fbgad dac cbeag dfbecag dc fdacgb | cagbe gadfbe dcfbga bgcad
+gefcb edcfg bega befdac bagfec cadbegf bce bcfag dcgafb eb | gbceaf bgcfa acefgb abfcg
+bgfce agbfc fga dabceg bdagfec afdcgb gcdba adfc fa baefgd | gfacbd fa agf gacbde
+gbfa bef bgeda cbeadg begdf gfcdaeb egcdf dfcaeb bdfage fb | fb dfbeca gfecd abgf
+dbfeac ecbfg ec dceg afbdcg gefbcd dbcfg geafb ecb bdegfac | fagdebc cadgbf gbdfc ec
+fgdbe beadfgc dfeab gbaf gf gdefca degcb aefbdg facbed gfd | fdcgae dgfbe fgd bfdae
+baecfd aeb cfae ae dgbaefc facdbg fbgead gbced bfdca bdeac | afce caef ecbda ea
+aedgb agf abefgcd fabgd afgebc faed dgfaeb bgfcd edbcag af | af adefgb adfe abdgec
+gdaecb gbcad gbcae cgfabd ebgfc ea bagcfed gae dbfage cdea | abdcg gadbc eacd adbegc
+fcdbe febacg gcfd egf ebgdf fecgdba cfdeba gf agbde fbcdge | gfe abged efg cdfg
+gb gdceafb bceaf cebgfa aedbcf fgb acgfb fcdag eagb cfbdge | efagbcd agdcbfe fbdegc abge
+ebfac cbeafg df dcbag acfdbe cfdbeg dfb gecfadb feda fdbac | gdcba gedfbc gedabcf cagbd
+cbfdg gbacf gdab bcdfeag dbf fgdec cfdabe dgbfac fgaceb bd | dcefba fgdce edfcg bafcg
+ec dacfeg aebc dfaegb eagdb gefcabd aedgcb dbcfg dec egbdc | fbadecg dfecag efgcdba dfbaeg
+gafbdc cbafde cfgebd gabcd cebag ad cad cafdebg bcgdf dgaf | fagd efcdbg acd bfdceg
+cde afebcdg bagcd ce fagedb dcfgea afbced efcg cgeda gfdae | acedbgf cabfed cefg dce
+cabg geabf gfbeca dfgea gfbeacd dgfceb gbe dcbeaf befac gb | agdfe dcfeab adefg eafgd
+debgacf edgab agedcb fdega ab cadfbg bad cbea bgecd dfbcge | adbge dabegc fagde abd
+bdefac afgbc abcef ce bdefga dfbea cef bgdfaec ecdb agfced | dcbe caebfd dgafec acbgf
+aecfbg gdaefc becgadf bdgfa cg efbcad decaf fcg acgfd edgc | cfbdgea cg cefdga cfg
+fd dgfcaeb fedg dcgbe bdgecf bfcde abcfdg dbf becaf bgeadc | cdgbea df egdcfab cdbfe
+aedcfb bdecg bcdefg cd fbadcge edc gdcf gbdef bfagde begac | befadc bfeadg fgdbe dc
+de cgadf gde gecfb egfbac bfde dcabeg ecbdgf efdacgb dcgfe | defb bgefc ged cbagfe
+egdfba cdafbge gfa dfgab cbdaf becgad bcgafe gfde bagde fg | bfcedga bacgde geabd cfbda
+bacgfd gec cbfeadg gdeaf afceg ec dagecb gacbf egafbc cefb | abgfcd fdabcge egc abcgfe
+edbgac fecbg adcgef fdbgc cbaeg feab bceafdg cgbfea fe efg | abfe fdbgc aebf cgadfe
+afbdcg dacbf cdbgf acdfe ebafcg ab beadfcg cfgbed cab dbag | becfgd abcdf bdcfaeg egbadcf
+dafceb gebfad cebg gbdfeac dfcga dgbac acedb gbd ebgcda bg | deabcg bcgade egcabd bdcafe
+gfa agcfe fbcae cedbaf cdfge ga gcfaedb afbedg cgba bgaefc | bagcfe ga fbace fceba
+eg cbaefgd dagfb adcbeg aeg cefabd bgec dgeafc abdce dbaeg | fcagde bdcage gabfd acdegb
+dfeagcb ebf eagfc gbefac cgdfea dbfag eb dcbafe gecb egfab | eb dgafb faecg eafdgc
+befdc gfbceda ecdgba bfdacg cde gecfb deaf bedafc ed cbdaf | becfd bdacgef eacgdfb gbdace
+agdb cdafegb cfabd cedbgf cdafeb fbgac bgc gb adcgbf faegc | cbgadf dabg fgeca cbgfa
+cfeabg cfeab fbge gcdae fgc aefdbgc gf gaefc dcgfba ebdfca | abefc cgf fbdaecg bafce
+cbfgda ebfdcg dgbfa bd fgdca abecgdf dgb cegfda bgfae cbda | gdcaf fdgab cbfaedg cgaefdb
+ef cbfgae abcdf adecfbg gacbe abecf agdbec ebgf dfceag cef | efc ecf dcbaf cbaeg
+dgcaf bgfd aebcd ebacgf cdafb fdabecg bdafgc adecfg bf fcb | afcdb fcadg fcadg adgefc
+afcgeb fdgc bcaefdg egacf ged gd faebdg cdaeg badce cfaged | cedba egcbaf dfbagce eagfc
+edgaf aegdfc dgcfba befdag cd cafdbeg cged facde eafcb fdc | gebfad gefda fcd agdfe
+debfa dcgbefa gdcbae cdfbae ab bdcegf cebfd bea cfba agedf | fgecdb bcaedg feagcdb fecbd
+abfecg fdegca dag cead dbfge gaedf da afcge cdgfba gbdcafe | gfedb bgfdac dag agdfe
+acedgb dagcebf abgcf acgbd fbgd afb cgadfb ebfcda fgcae bf | agcfe fgeac ebfdac bdcafe
+adecfg cbda ecabf egcbdaf fgaedb gcbef cfbaed bfa ab efdca | fbcae fcaeb dbac cfadeb
+aecgdf bgcea dbc facdgeb efdb db edgcb cdgfe cgdfba gcdfbe | fdgec bd gcdabf dbecg
+cbgdfe gbdfa dbe bfgdeca cgbdae cbefag becag ed aedc agebd | ecgab fgbdce aecd dace
+cfbed gfcbea abdefc gbfcd eabd dce de geadfc cbgdaef febac | ed egcafd cde edc
+fgcde fcbad fdegca ae fdcea dcegbf geaf eac badecg aecgbfd | egdcfa dbfac gafe ae
+bgadcf acgdf afgedc bdgeacf bfd cbaed fcgb agfdeb fb adbcf | fdbgca fdbcag acdegf cagfde
+gacbfde ebgdcf eabcfd fae fa bfead cabf cbefd gfcaed gaedb | fa fcdeb fecagdb bfac
+adecf cafbd bcdagf gbadc bf dbf gdebca edfagbc bfga dgcebf | fadbc dgcfbe dfb feacd
+dfgae fgcedba ge bcfade caedfg dfbga fdcea gaedcb gea gefc | cfeda fbagd gea eag
+dafceg dfba cdeabf da bedgafc adecb gecab fdecb febdgc cad | caebg cbfde abdf ecgab
+daebg cebg bcdae gb bdg cdfgba bfcagde dbaceg fdecba fdega | geadf dabge gebda ecabgd
+afedbg feb bf acfb dbeca bfegcad cdefg ecfdba dcfbe bedgca | facbedg cfegd cfba ecfdg
+bd abgcf cfgebd cfgdae abde dafceb fdb daecfgb fcdab cdaef | bd cbfda cabgf daeb
+ge cdfga edga caedfbg edbgfc dagfcb efcga cfagde feg faebc | gef eadg fcbagde efgbcd
+cabegd bec eafbd bagc dfcaegb dcgae cb ecdba bdgfec egfcda | cegdfb dgcae decfgb bcdea
+fcbgead af cdbga fabegc cbafd fead cefbd fbcdae gdebfc baf | cadbf cfdab efbdc baedcf
+edfbag bgc cfba ebgcaf cegdfab gfbae eadcgb fecgb fedgc cb | bdgeca cb cb dfgce
+bfadecg fad baedfc cabef gacfbe agecdf cgdfb aedb da acfdb | acebfgd aecfb efbca agbfdce
+defbca ebcdgaf fgbe gdcfa degcba decbgf fe defcg ecf bdegc | eadbgc fgbe gedfc dcegb
+bagecf bga gbde gb dacbf gefacdb edcagb cfgeda gdace cadgb | dgacb bg bdeg acdeg
+bdc dgbafe cabdeg bfgde befac defbc cd fcdg afgecbd gbfced | cbadeg cdfebg gaebcd gefdb
+afgce dc fabged gbafd fgcda gecdbf badc fdcebga cdf adcfgb | cfbdge dabc dcagbf dgfabe
+cdafeb egf afbeg dagbef cfbgead edag cgebdf gbcfa daefb eg | dabfe fbacg efg eagbf
+edbf afcbedg eacbgf fd efadc fagbdc abfcde daf becaf acdeg | cgfdba efabc adf fgcbda
+gcabe bcadeg dag dgafcbe agdcb faegcb dcbaf afebdg egcd dg | gdfeab cagbd bfceadg gda
+gafcd cbgafd gbafec fcgade bcfgeda cdea bedfg ea fae eagdf | acgdfe deacgf efgdb fdgac
+fecagb ae cgfbe gdafb fecdbg faegb gbcefda aefc aeg gecbda | gae ebgfc edgcfb adbegc
+fgced gcdfbae fec edcb ce bgdfe dfagbe acgdf cbaefg gbcdef | cdafg gaefcb becd cef
+begdc bacegfd cadfeg afbgc cbdagf egbcf feg bgacfe feba fe | fcbeg gbcaf egf fe
+bed eagdb fagdb efadbc aefbgc ecgd ed gbcdea cadgefb bgaec | bde de ed ecdg
+edbgfc ebfacg cdgef ga daegcf gfa bfacd aegd fgadc befgcad | cdbfa cfedabg dagcf gfbaecd
+gdacb bcdgfa egacdb facb cf cfd cgdefa gbfde egcafbd bcgdf | cfd aegcdb fdc cbfa
+fdca cagfb ac gcdbef bcfgade ebafg bdgcea abc cgfabd cgdbf | fgcbd febdagc bdgaec gbedfca
+ca dgcfb fgead gca edcgfa fagcd gecfba aedc dfeagb acegdbf | ac cga cade ca
+def gfbdc ebdgaf cbde gdcfe eabcdgf ecgfbd dbfgca gfcea de | dbec fecga dfbgc dcfeg
+dacfb bed gcbaefd fbcdag afdecb befc edfab agefd dabecg eb | dbe bdgfac abedcf cdbgfa
+abf cbadf cfagdb acgf fa fdbcg bfagde befcdg dcegabf cabde | agcf fa bdaec cfagbde
+edbcag aebcf afgb fcgbde beagcf bea cgefb ba edgfacb faced | aeb gbcdae ecbfa decbgf
+ad adgfcb afgdc ebafcg eadgfcb facgb ecgfd acdb gda gdeabf | fcegd cdgfa abefcg dcafg
+cfebd gfdec feadg gec gfabed cefdga cg gdca gebcfda aecbfg | cbfeag dcag gc cabdfeg
+eafdc fac af ebdcf bagcfd gfae eagdc bcfegad gebdca gcdefa | fcbgda dfebcga gdbace defcb
+dagcf aecdgbf bedfgc bafedg adcbg gdcbea cgb dabge cb ebac | fgdebc edfabg fdcag ebac
+bgdaf cbdgef bdcag ac abgedc afgceb cdegb acde ecgbfad cga | adec gbcda dbcge edac
+gbafe gabecf gaed edbgf ed abedgf bdgcf baefdc def cbgefad | febga agde fed gfdcb
+gefcba fgb gf eabdf gcabd edfacbg bcfadg dgfc dfgab gdeacb | fgadb gcdabf fg gfb
+gbadce cbdafeg ce egcdfa agdeb fbdac ecgb ebgdaf ced acedb | bcafd ecbg bcadf gedbacf
+ag fbcgead baefcg cfbgd feadc adge fgacd dcagfe dcafeb fga | gaed abdfce ag ecfbga
+efbgdc cbagf gcdabef fegcda gcdaf daeg gd deacf fgd acedfb | fadgc fgabc befdac dg
+ed gcefa dcefga fcdbgae dcgea efbdac acgfbe dbacg aed gfde | ed efcgba adgce de
+afceb adbfge beafg bga bedfgc ag bcadgef dgbfe gdaf geabdc | ebgcdf gfcbde ga edbfg
+gafcde agcfeb fdcge ebdfc gebfcda gef gf fgda eagcdb edcag | fabceg bgcfea fagd ebcdf
+ecadbf bedfg da dgfbcea bacfge ebfad bcaef deagbc adfc ead | dae fadc fdgceba debgf
+adb fbcae ad acfebd gefcbad cefgab bcdaf gdfcb ebagfd eacd | dbfca fdegbca abfecd cdbfg
+fbdcga ebfcd fbadc ca fabgdec bca bagfd bcgeda agfc bgefad | gafbcd cbedf afbdg afbdgc
+ecfdba cd facegb gbacde gcbed dce cegba bcdegfa befgd cgad | ced cd fcagebd dce
+ebdca fcabge dceagbf dgef fbedc ef feb cdfgb cdbfge cgafbd | bcade gfbcae cfgdeb efb
+eda egabfd egfacb da fdbegac gdecb adfc dacegf acdeg feacg | dcage cgbde faceg gcefa
+efcgda fgec dafebg agfcd aefgdcb gf ecadbg cgead fga adfbc | fegcda afdebg dbafc fag
+gbdaec gaecfd cbdag acfbd cfegabd fd fcd cgfadb fdbg fbcea | fd ecbagd fdgbeca ebdcfag
+dbgacf efgad abcf dcebagf ebgacd cfbdg dgcefb ab dfbga abd | dbgeacf cfdgba gbdecf gbfad
+abegfd cdafb bdfag ecagdf ag acegfdb ebdfg fag cdbfge bgea | fga dcegfa dgfeb fceagbd
+cd acbefg cdfge dfaceb gcaefbd cfd fcaeg egdbf dacg daegfc | egcfba cadg cd dcf
+gebdfca cdbefg afcg gecbf ag debacg dbaef fabge aeg gbcfea | cgbeda gfecdb ga cgebad
+cgdfeb dfacbg ecd cadfg cadbgfe aegdb fedgca acef cadeg ec | cgdae agbde dfcebg cgfdeba
+fg bdcagf ebacfg gbacd cgfd gfa dgbfa adcbeg edbfa dfabegc | aefbcg agbdc fdcg agcdfeb
+ba cbgefd fgace bae cadb edbfc abfedg caefdb caebf gaebcfd | bae cadgefb efdbc ba
+edcfb cdabe gacdeb dabfecg gefacd aedgbf dac bgac ca edbag | facedg dfeagc daegcb gdabce
+afbdce gfc fecagdb egdaf gfbaec bdcfe bcdegf efgdc cg bcgd | gbcfea dfgebc cdefb cg
+cgdaeb dfbacge cgdbe acb gcdfeb dfcga ba fcadbe gbae bcdag | fadbec cadgf ba ba
+cgdeb ebfcag gbdafc bgfde gecdba ec abgdc bce dgecafb cade | cdgafb dcea gdabfc bcagdf
+fadbec gecfbd deg ge afdgce bdfec agbcd ebfg cbedg fbedcag | bgef abcdef cgbde cbefgd
+aegdb befgcd gec ecgba aecd cfbag bdefga ce gacdeb dgecabf | eadc gbfced bgcae dgaeb
+cfabd fbedac cadfgb eb bce cdegf decgab eafcgdb cfbde afeb | fdbec fbacd be ebcadfg
+bdecga gdac cdbefg dc bcd baecg bdeac efabd fgceab dbacfeg | bedac faebd baced egbdca
+cg cafgdb bacfde gfaeb cfadb bagfc fcg ecbagfd fdcega dbcg | febag fcg bgcfad gadbcf
+fbde fgd df bagef gacdebf cefabg agdec gdafe gaebdf bcdgaf | efdb abfeg febd debafg
+aebcgd abcdfe bdfeg eaf dagecf cgaf bfacdeg fa gdeaf gedca | cedag gedfb agbecd afcg
+fedbcag cgfabd gba faegd eadbgc gceb bgeda bdcea gb aedbcf | beacd ecbg bdaec adgbec
+cfge gc gebfcda fbadc fdbcg degfb gebdac gdeafb dcg fcegdb | dcbgea debgf cdbaf bgcfd
+ceafb fegbdc bcfed ecd daefbg dfgecab cgfd dc aedgbc begdf | edbfg efcab cdfg bdgef
+ecag fegcba bfgac cdbfg efabc befdca afg gcbaedf abefgd ag | fedcba fgcbd ga acge
+badgf cgaeb ebdga afcbde ebdgaf fged acfgdbe de ebd fdbacg | gfdbea badefg dgeba beagc
+beagcd cga cafgedb ac febga fgcba cgfbd dgfcab gcefdb cfda | ac fcda agc ac
+dabefc abgfdce decfb gf gfed cbdgf bdegfc gfc gafcbe cagbd | cfg dcfeb bcefd edfcb
+gedab acd ceba agdcb bagdce fcgdb ca dgaebfc dfgbea fecagd | adc acd adegfc cda
+dg eafdg gcbeaf dcfaegb acgebd fadgbe dgbf daecf fgabe deg | gdfae bgfae fgbdea becdag
+decgfb bcgfdae agcbd afcdb fb ebaf fbd cedabf ecdfa ecfdga | dfeac fbae fb degabcf
+feabgdc gfdbe bgcad cf geacfd dafbcg cbgaed fabc cfg cdgbf | dbcag cf cebagdf gfdbe
+gdbef ecdgb efcd cdgba fabdeg fdcbeg faegcb ecg fdegcab ce | bgefcd gcdba bgdef egc
+gfebd abd cdfbga gcdea edcbfg abfe ba gebda dbeacgf eafdbg | beagd egdba ebdfg fdageb
+gafbcd bc bac fgeba fbdega agbec febc egadc bcfgaed beacfg | agbfe cfbeag gceda adegbf
+cdbg gfcead db gcbfde bdefc gefdc bdf fcdbega fecba dagbfe | dcabgef fegcd bgdc cgfbead
+bagcde efbcgd adgef fgaecdb bfeacg eabfg cebfg eab ab cfab | eafgb bacf ab eba
+ed dcfbeag dfcga cedb cbfae fgdabe dbcefa fbagce dfe dacef | afbgec de cadfg de
+dgc abfedg bdgea cbfde dfcgab ecag gbcdae cg gdfbcae gcbde | afbdeg dgabec begad gdc
+befcd dg bgacf fbcegad dgb gcad gbcdf fagdbe bfcage gfdcab | gdabef fdecb gcda agcd
+cb bgdcfe bgacefd fdgbe edcgb cegad cbagfd dbefag bdc efbc | cgade gbfaecd bcd cbdge
+adfcge afgd acfeb efcda da gdefc cegfbd bcegad fdbcage cad | defgbc aebgdc dgfa cadfeg
+gacdf bdg aegbdc bg debaf bfeg gadfbce gfbdea cfbeda gdfba | bg fgdca bg gb
+adbecg dfa fd gafbe gefda cefgda ecdag efdc abdfcg egbcdaf | fegba gfadec fadeg efcd
+ecfgad gbae ecdag ba agbdec bac fdabgc edabc cdgeabf cbfed | dcfeag cbegad cefadg gdebca
+fgbca cge gcefb gadebcf eabcfg gcadbf feag eg fecbd egdabc | ge afgdbc fgdbac egc
+eadg eadbc gfbcda badefc gdc fcgbe dcbge acfgbde dacgbe dg | cgd egbcd gcdfba agdbce
+ga befgac fcgedba fabced agfce edgfc gbea aebcf acg cagfdb | gecdf afebcd bgdfac cga

src/main/scala/de.qwertyuiop.aoc/2021/day8.scala

@@ -1,6 +1,77 @@
 package de.qwertyuiop.aoc.`2021`
 
-import de.qwertyuiop.aoc.lib.*
+import de.qwertyuiop.aoc.lib.{*, given}
 import cats.*, cats.implicits.given
+import util.chaining.given
 
-def day8(using InputSource): Unit = ???
+def day8(using InputSource): Unit =
+  val inputs = input(_.splitOnce(" \\| ") match
+    case Some(possible, out) => (possible.splitNN(" "), out.splitNN(" "))
+    case None => sys.error("invalid input")
+  )
+  SevenSeg.part1(inputs)
+  SevenSeg.part2(inputs)
+
+object SevenSeg:
+  val uniqueLengths = Set(2,3,4,7)
+
+  val digitForSegments = Map(
+    "abcefg" -> 0,
+    "cf" -> 1,
+    "acdeg" -> 2,
+    "acdfg" -> 3,
+    "bcdf" -> 4,
+    "abdfg" -> 5,
+    "abdefg" -> 6,
+    "acf" -> 7,
+    "abcdefg" -> 8,
+    "abcdfg" -> 9,
+    )
+
+  /*
+   * 0 abc efg      aaaa
+   * 1   c  f      b    c
+   * 2 a cde g     b    c
+   * 3 a cd fg      dddd
+   * 4  bcd f      e    f
+   * 5 ab d fg     e    f
+   * 6 ab defg      gggg
+   * 7 a c  f
+   * 8 abcdefg
+   * 9 abcd fg
+   *   8687497 < number of occurrences
+   */
+
+
+  def part1(input: List[(List[String], List[String])]) =
+    println("Part 1:")
+    println(input.flatMap(_._2.map(_.length)).count(uniqueLengths.contains))
+
+  def part2(input: List[(List[String], List[String])]) =
+    println("Part 2:")
+    println(input.map((digits, current) => decodeSingle(digits, current, false)).sum)
+
+  def decodeSingle(allDigits: List[String], current: List[String], outputWirings: Boolean): Int =
+    val byUniqueLength = allDigits.filter(uniqueLengths contains _.length).map(d => d.length -> d).toMap
+    val charCounts = allDigits.flatten.countAll
+    val b = charCounts.find(_._2 == 6).map(_._1).get
+    val e = charCounts.find(_._2 == 4).map(_._1).get
+    val f = charCounts.find(_._2 == 9).map(_._1).get
+    val c = byUniqueLength(2).filter(_ != f).head
+    val d = byUniqueLength(4).filterNot(Set(b, c, f).contains).head
+    val a = byUniqueLength(3).filterNot(Set(c, f).contains).head
+    val g = charCounts.find((char, count) => count == 7 && char != d).map(_._1).get
+    val decoder = Map(a -> 'a', b -> 'b', c -> 'c', d -> 'd', e -> 'e', f -> 'f', g -> 'g')
+
+    if outputWirings then
+      println(s"""
+       |  $a$a$a$a
+       | $b    $c
+       | $b    $c
+       |  $d$d$d$d
+       | $e    $f
+       | $e    $f
+       |  $g$g$g$g
+       |""".stripMargin)
+
+    current.map(_.map(decoder).sorted.pipe(digitForSegments)).mkString.toInt

src/main/scala/de.qwertyuiop.aoc/lib/extensions.scala

@@ -24,3 +24,6 @@ extension (s: String)
 
 extension [K,V,W](map: Map[K,V])
   def mapValuesS(f: V => W): Map[K, W] = map.view.mapValues(f).toMap
+
+extension [A](input: List[A])
+  def countAll: Map[A, Int] = input.groupBy(identity).view.mapValues(_.size).toMap