Day 8

Cargo.toml

@@ -30,3 +30,7 @@ path = "src/day6.rs"
 [[bin]]
 name = "day7"
 path = "src/day7.rs"
+
+[[bin]]
+name = "day8"
+path = "src/day8.rs"

inputs/day8.txt

@@ -0,0 +1,200 @@
+fbead dcabe bcega gfbecd ecd dgac cd bedcag agebcfd fcagbe | ced cgbefad gbcaef cd
+bdef fbgeadc gabfc fadegb adefg abe be decagf dacgbe begfa | dbfe gaecdf fbgae agfbe
+gad cgdfab ag edacgb agbfedc facdb dcebaf adfbg agfc gbdef | dga gacfebd adbgcf adgbce
+cebadf gadcf egabfd ecabdfg gfcbd dacef geac ag afg fgdaec | aegc gdeabfc fgedac eacg
+ceafb gcbfea eacgdf cegb eag bgfda eg fdaegcb ebagf adebcf | eg adgfb ge ceabf
+gcdfeab bfdcga gdacf fe fae bdefga eafdgc fecd efagc aecgb | dcef fea cgfda gbcae
+gbdce cfdbg efbd gbaedcf dge gfcead bcgae de bgacdf befdcg | gde fcbadg egdafc dbaefcg
+adgecf agecdb dfcag cea dafgebc egbfc fdea ea agbfdc caefg | gcdfae aefcbdg fdgebac eac
+dgcea acfged eagfc abdec dcg gd efcgdb adfebcg bceagf adfg | dfag dgebcaf dfbcage dgc
+aedgbf dgfabec aefb edbgf gabdc ea gedfbc cgdefa dea baedg | ae ea eadbgfc fdabge
+afgbde agbef df fda caegfb efdb fgdbeca fcdgab agedf cgead | fad df fd bedgcfa
+bacdge gdecbaf bdfcge fabec dc dec cfbed gedbf dcgf agbefd | bcedf fgbed bcafe cfbedag
+gbcafd bcd db begdc gedcfb bgdfeac cgdef dbfe gceab adecgf | dbc bd ebgdc bgcfda
+ebafgd dcafeb ag gfadb aegb agd edbaf adcefg gcdabfe gdfcb | bgafd ga ga ag
+gcbfda acd facdb aecbgf gafcb ad agbfced bacdge efdcb agdf | gbdeacf ad bgedca dcbagfe
+gfae dae ea ecabfd edbgc aegdc cgfdae fcadgb facbedg gdfca | dfeagbc cdeabf dea ea
+egafb ec dcegafb fcdag bcef cae cdgbae egbcfa abfdeg eafcg | bfacedg ace eca afgdc
+bfgadc fabgd fcgb gecadf adceb gc cgd dabcg gadfcbe eadfbg | gbcf cebda cgd cg
+abfdg dgabe cgbead efdb abfgced gefbda daf cfadeg cbgaf df | gfadb egbda bgdea bcadgef
+aebcf agdbf adgbfce agbfec egcf acg bgacde cgbaf dfeabc cg | aefdbgc gc efadbc gc
+bacdfe baefc edacb abcdg bafdge cgfbdea de cfebga cfde bde | ecfd bde cfbea fagebc
+cefd cf afbegcd gfdcab adegfc baegf dgcea fcg cgebad gfeca | gdeafc fc decbgaf gedca
+dgcae eadgbc eafdgcb ad badg deabcf gefdbc ade bdceg fcega | ade acedfgb acegfdb becfda
+bfadecg cfadge bcgfd bceagf deabfg edg edca ecafg cfedg ed | cead deacfg ged gbfaedc
+egafd dfbgcae bdf bfade dgbcfe bagf beacd fgbdae cefgda fb | fb gabf bfd cefagd
+afedbcg eadcgf gebdcf agdfb ceagf baecfg de gaefd cead egd | bdeagfc ecda agbfd dgafce
+bcde bc fgdceb bfc faecdbg adgfb cdfgb fbegca dgafce fdegc | cdgfbe fcgde cfb fcedg
+bgacd cbf fceda fb gacbdf cadfb bdagce fegcbad beacfg fbgd | ecafbgd bfdg gcbdefa eacdbg
+dgbec afecgdb fbgce dbgcaf becdfa bagcf efb ecfabg geaf fe | fegacbd ef fcbge abgfc
+cedfg cgfaedb fgcdea gacdf gcae begdaf cdbaf fbcdeg ag gad | gcfebd cadfeg adfcb afcbd
+edgcfba cdafb agd cbegfa dfagc acefg cgdbae dg dgceaf egfd | fgecba gad aebgcfd agfcd
+afecdg bce gdeca cfdgbe bgca cfabegd daecb bfeda gabcde bc | bgca bec gabc bc
+fgbdc gad ad eabdcgf gdfeac ebdfag baegfc gadfb ebad begaf | ebda dfabg adg bdae
+bgec dbfga degfc eb deabfc fcdage bfe gfbced gfedb gfdcabe | bcge begc efb bcgdef
+efbga bfeacg dg dfg afdce eafbgd adbg fdbcgae fcdebg eafdg | dbag fdg fgd gbad
+cdabe agcbdef fgaed dbcgea fbce bfacdg fb faebd dbf fadcbe | bcgfda bf fb fb
+cdafbe cbdagf fcgade fbage fbdae fdbca ed efd adfgceb bcde | ed adcbf bgdcfea ecbd
+fgab gfacbd gfdcb fgdecb eagbdcf bdacg ag gad edgcfa eacdb | gcfdba fgdace cdegbfa agbdc
+egcaf gdecbf beacg cfba dgfeabc abfgec baegd bc ecfagd ecb | bcaf cbaf gdecbf ebc
+agfce cgedfb gbdfe daf da febgda cgfaedb adgb dgefa ecabdf | bdfceg dgab adf gadb
+begadf deg aecfgb aebgd aebfg ceadgfb fead ed dbcga egdcbf | ged fcgeab gdaeb de
+ad debcf deabgc acegbfd daef febcda cgebdf bcafd cda bfcga | acfgb cbdaeg gecadb acd
+fadbeg bagdcf bcda fceag cfd bdgfa dabgefc cd bdcgfe afgcd | acbefdg dc gfcea bcda
+fcbge bg cgdeaf bdegcf beg bfeca gbdc agdefcb gcdef bgefda | egb bgdfaec bg feacbdg
+gcfabed dae geaf afdgc dfbcag cgadef dcebg defbac edagc ae | cdgae ae eadfcb egaf
+ceabf fabcge cgfe gecabdf dgafcb bagcf edfagb ef cdeab feb | acbgf fabecg bfe badefg
+adg bdfaeg bacd gcebd cgadbe da caedg egfca bfgdace fdbecg | dcab cgeda agd ad
+cbdafge ecbg fabec caefgb cb abefd fcdega bac adbcfg efcga | cb gcbe bac dbgeafc
+gfcbad fbc cf ebgaf acdbe decbfa dcbeag cdfe efgbdac fbaec | aebcgdf bfc dcaebfg edfbacg
+dgcf bfaedg bdf cdagbef cbead df cebfg gdcfeb fbdce gabecf | fd begcf df df
+bc egcb efabdc cfb gefdba cbfgade gbdef fdcga gfbcd gbdecf | cfagd ecbdaf cbf dbfcae
+bc cbe cfega gbecaf fdcega dbefa cbgdfea efacb cdbega gfbc | dgceabf ebc bce fcgb
+cf gfcdea fdage gfc dgcfe debcg fcbdag gefdba afec cgfdbae | deagbf eacdgf dgcbefa dfgec
+cdgfbae bc ecabd cfabdg dfageb cfeda debga abc begdac egbc | bc cb acb adegbc
+fd caegfd fed acfegdb bcfed cbadfe abfd bcaedg egcfb eabcd | dcabegf cbgdfea bfda cadbe
+dbgac ebd faebdg afbcdg efcbg aedc dbgeca dcafgeb gcedb ed | aced edgbc ebd ed
+fea dfbga bcedf fgadbce ea aebg bgfaed gdafec dbefa bdgcaf | abdef gdcafb dgbaf ebfad
+eac afdecb dbegca acdfb dbacfge ea bcfea ebgfc fade fadcgb | fcbad ebcfa edcgba dacbf
+agfdbc adcbg fdgc cdfeagb bgd eadbc edfagb dg abcfg bfaecg | cdfg dg gbeacfd bdg
+fdbag gafcbe agfdcb bfc cdgf bdagef cfbda bdeac bcfedag cf | bdeca adfegb cbfad cf
+agfdce ecd cbeadg ce bdagc ecagfbd bcegd abce bfedg gcbfda | cde cdbgaef ceadfg eabc
+cgbda bceag bcgfde gdb dcabf dg badefgc gdae adbcge cabgfe | adcgb egdbca dgbfaec gdb
+baefc gecfb bfadc dabcge cdbfage aeb ea bgafce ebdgfc efag | bfgdaec gcdebfa dbecgf dagcbe
+bgdcfe cafdg cad acegf fgcadb fdcbg faedbc da gbecfda dabg | acd faecg afcdg fdbgc
+gedbcf gef cfaedbg egbc ge gfcaed dcbfea fgbad dgbfe fecbd | eg gfe gcbe bcge
+fca cbfge faceg fbeadg gdefa ac adcfbeg ceda cdbgaf dgaefc | gfabcd afc degabf fac
+dacfb edbag ce abdfgc dcfe ebcda gecfab befacgd feadbc aec | cea dabcegf cea badfcg
+edabgcf eadcgf dbgecf dgeca dcbaf adcfg fgd gf faeg decbga | bfcdeg dgfca edcafbg dcafbeg
+abegcf bedaf fc ebadgc cbf fbcagd baecg befac defgacb cgef | ecbaf fbcdage cf bfc
+acg bafgdc afegb bfacd bgeacfd fgdc cg aecdbf gdaebc cbafg | afdcb cbfgda acg abdfc
+ca ace afcb afebcg ecfbg dabeg gfacde gbace cfgabde cdbfge | acbf cfegb gebad bacf
+dgfcba fabcd cgbfae dbaegcf eadcf dagbc edbcag gbfd fb bfc | ebagdc fb edfgabc gadcb
+gdaec dfgb dcgbefa bde ebadg cbfage cabfed efagb db bdgafe | bd abegf dbe deb
+caebfg bf bgead dgecab bdaf bgdafe fbe dfgbeac bfged fgedc | cbgeda efdbg edacgbf feb
+begca fbaedgc adbfgc adbecg bcaefg af afb cdbfe feag beafc | fadgcbe af bgdfcea af
+dceab be gcbdaf ebc abfe bdfac cdbafe cagdfbe gbfced dgcae | acfgbed eb afbe eabf
+fegdbc acfdb afgce badecf badg ebgafdc gd cgadf gdf dcabfg | agcfd fbdac gfd egbafdc
+beagd fbcg gbecfad gc bacge adbefc aecfb acgdfe gfbcea egc | gc efacbgd agdeb cfbg
+adcebf fgebadc ga ega bdga edafb egadf bcgeaf dcefg afdbge | abdg dbag edcfg fbegadc
+fe efd egfbdac dcagf cgaebd cbfe gdceb dfegc efagbd fdegcb | ef gdaceb befcgd gdcfbe
+badf bfg dafgebc gdabe edfbg bgfeac bf bdagef dbaegc fecgd | gacfbe bdagef cgaebd adfb
+efdabg bedac fb cgedab cefgdab fcdga adfcb cbfe dfb ecfabd | bfd bfec debafc acbfd
+cbdag fa bdfacg dgfac defbag cbaf gecbda agf dbegafc fgcde | gdcef cdbag gaf gcfde
+cfagd fbagcde cb efdabc dgaefb cfbe adgbec bdc acfbd edfba | befc cfbe efbc bcd
+bdcgfe acdbeg ac caed gdfba dagbc abc gbfcea ecbdg gbcdaef | aced dgbce cab gafdb
+bgfd fecdgab eadcf acbged gd acfgdb cafegb cdgfa cgd cfgba | fdgb gecadb gd gdc
+dbcfa gcebda becg dgeac dbe egadcf gdefab fgaecbd eb acdeb | bed cgbe ebd efbgdca
+ebfd cgfdea fbdagec afbce bfdeac geacb fb dfabgc fbc dacef | fcb abcdef cfb fb
+gceab bgef gbdca abdecf efacg ecbagf ebc cgdeaf eb gdfbcea | ebc fdcbgea eb fcedbag
+cdfeg de edg dbcgaf defbcg cbfgd gfcdabe bdef gdebca efagc | bfacegd fdceagb fbed gcebfad
+fecbdg fcagebd adbgfc ceba gecad dgfea egdcba dac gcedb ca | cdabgf edfacgb acbgde febacdg
+gefacd febcga fdg gcfdb ebcgf cgdba gdcefb fd bfedgac bedf | bdagfce gfd bfdcge geacdfb
+bacgfd ec cgbafe adbgfec acfbe fbeda eac ecgdba acbfg fceg | dcgaeb fcdgabe aec afdbe
+egcd dfeca efagd fdcgae egf ecbdagf eabdfc fecabg dfagb ge | feacd eg gcde feg
+begaf dcfegb dbcge gadcbef fc cdabfe fgdc decbga cfb becgf | bfc fc cdebg cgfd
+cfbdgea fdg efbdc fgdecb gd gbeaf agdfcb cedg adfebc gfdbe | cfdbe afgcdb dfcebga dgec
+fdebgc egba dcaebfg abfgcd ba bda gdceb cefda degcba edcba | dba bdafegc decba bad
+cgeb bdgcfa dfgcb efcdg ge abfged efdac eabdcfg ecdfgb gef | cedfg eg fcade eg
+eabdcg gceb ec ecfadg baecd daebcgf afdeb badgc bafdcg ace | bcdgeaf ec cebadfg ce
+ebdf cagfeb efcda ecbdag ecdbfa aebdc cgdfa eaf caefgbd ef | eaf dcbea acgdbe dfcbega
+gdbfa gfaeb cafbgd adb cedbgaf faecdg edfbca bd dcgb gcadf | db bcdg dgfba dbgc
+fbcdga cea gbcaef decgb gcdfa eafd afcdge adgec ea dbceagf | eac egbcdfa ae dfea
+beagcd egcbd gbae eagcdf gdcefb cbade fabgdce ae fbcda ace | bage cae ace ageb
+bacgf bdgac dcebfg eacgbd fdgbcea gfdbea dc aced bdc dbega | bcd cd bagde bafcg
+gfabdc be gcedba fecabgd edcaf egbf fcabg cgbaef abcef bea | acegdfb fdbcga eb becaf
+dgfbec bdecga dfgca fd aedcgfb adgec adef fcd fgcab fcegda | cbfgeda cdf df fdae
+cgfbe faceg bacegf dfgbe aefcdg abdcef cb gdbefac bfc gbca | cdgefab bc cbfead cgaefd
+gefdcab ebcg fcb bfdce afedb fedgc bedfcg dcafgb degfca cb | bc bc dbfecga cb
+efagc cagfde fb bfe begfa gbead badcgfe bgfeac fbca fdgbec | eacfbg efb feb bf
+gebdca af afb afbed bcafgd fabgde fbedc afge dgbae eacdbfg | agdfebc af abegcdf baf
+egbad cfedbg gb dbg cfdaeg bdeaf dgabefc cdbega cgdea cabg | efdab fedab gb gcba
+adfcb defca cabg gdefab afbdg bdgfec gbcedaf dbc gdacbf bc | dfeac bdc cbd gabc
+db ebcda ebgfac fcdea becga ebgadcf bdc cfedbg agdb bdgeca | fecda bd agbd db
+bagcef begdafc fbga fceab afcged ecagf deacgb acb ba bcefd | cfbedga abc deabgfc bca
+cbf gdbcae abdgc fb dagbcf gabf cdfea cabdf dabegfc fbgcde | cbf fb dgabce fbc
+dfbgec fcbeg fbeag afdecb fcdbga cegd dfbcg efc ce adebgcf | egdc acegbdf agfbcd cbgfe
+abgce gdec ce faebg agcbd bfcadg acefdbg defcab egcdab cea | gdfabc ce agefdbc ec
+acedg gbc geab ebdfc bg cbedg dacebg gdcaef fabgecd dagbcf | cgb bg adecg acged
+cfebad fbgda edg ceag agebd aedgcfb eg ecbfdg cgabde cebda | cbafegd gdacebf cega eg
+eacdf ea eadb cfgde cabfde bdfgac gacebf afe fbcda gcbafde | bagcfe fae adfcbg cadbf
+abd fgcaebd dbfgc gdeac fbedag ceba bcgad deacgb ab adcfge | dba bcea ab cfagbed
+afg bgfce af dcfa acbdge bacfg agbfde dgcfab dgbac defagcb | dfgcab cfgbad afg dceagb
+gdacbf ebgacf edbagc ae agcbf aefg acfbe fgbcead bcefd cea | eca adgfcb eca eafg
+fcbae bea bcdaf cadfbg fbgec ae eafd dacfeb bagcdef cbagde | fecbg cgedbaf gdcfba bae
+baefg daebgc bdgeacf gaecb efb feca abfecg fadgb edcbgf fe | bfgdeca gcbea acedgbf ef
+cd fdaecbg cdbga befacg fbdag decb dca gfcead dacebg gebac | edbc feabcg gcefdba adc
+agdebf daeg eadbfc gef dgbfec eg dbeaf afgeb fedbcga gcbfa | eg eg edgfbc efabd
+facd cabfgd fab geadbfc af gcbad egcdab becfg beafgd acfbg | fa acdfbge gdcaebf dbacg
+bcgfda gbeaf cfgba fae bace cfabge cfdgae gedbf ea dgcfbae | ae ea fcagb eafdcbg
+dbe gdcb ecafd edcgfba acedb gebdfa bagdce fegcba bd gbace | bd feacbdg bd gedbfa
+cabgde fagecb efb adfbg acebdf fecd afbdcge cdbae bedfa fe | cfabge fe dfabg bfdea
+bacg dafcg cdgfaeb fbcgda baefdg gda dabcef gfced cfadb ag | bgac dcfge egcbdfa dabfcge
+bdc gdac ecdagbf geacfb defcbg fabde cafbg bcfad cd cadbgf | acbdgfe fegcabd dafbc dcgbefa
+cedbf ebdgcf degc dcfgbae aebfg dfg bedgf gd aebcfd dbgfca | dbfcage cdebf dg dg
+edcfb ad cgad adgbfc agcfb agfebc bdacf cafgedb daf dgaebf | afcdgeb fda fda bfagecd
+agcbfde gadbcf bdfcge defgc dc afdge dcg gabfec ecbd bfgec | gcedf bcfeadg cdeb eafdg
+afdebg efa afbdc ecag egcfd debgcf ea fgebadc fdeagc defca | aef afdbceg ea dgeafc
+cgdfb fg ecdbf fbeacd bgdaef bcadg ecfgdab dgbfce gfec gfd | gf gf gfce febdc
+bgcde fedgc cgf gabcfd gdbefc defga fcbe cdabegf fc acbdge | bcfe efbc fc efdcgb
+cagb ab gdaecf cgeabd edabg fcdabe edbfcga bfedg cgdea eab | gadce gdefb abgc fedcba
+ecdafg feg bcgfad egbfa afbgc ecgfdab gaefcb eg afdeb becg | ge bgfdca eg fegadc
+fe adefg egdac cbagdef dcfeag adecfb dbfag edbgca gfce efd | fe efgc cabegd fe
+geab fgbaec gce adefc gcafdb agcef abgcf cdgebaf gcedbf ge | gabe cfega fbdceg eg
+eac dgefca cfgdba gdfeabc eadf gcfbe adfcg gcfae gacbed ae | agcdfeb ecbfg gedabc ae
+ec cdagb cegdab dagbcf cbaed ebgc ecd abedf fadcge cebdafg | ecd gacfdb becg ec
+abfge ce cgfdae cbed fecab fbdca egfacbd efc acgdbf cebdaf | dgface efc ec ec
+gbc gcdbf gb eabdfc egfb agdcf egbcda gcdfeab dgefcb fcedb | bgef gecbfd gb bgfdce
+ecgab gecabf cb gfbc abc afgeb daecg fcedab fcagbde efdbag | bdecagf gbfea ebgcaf cb
+ecdgb ab adgb dbecga fgbcde cadgfbe aeb eacgbf cabed eacdf | abdg cbedg gdabce cdbeg
+bgc dgeb bg fcbge befcgd ebcdfa cbfgda efcag cebfd fagbcde | gdeb fcgadeb bfecd cdagbef
+edbcfga cedbga bagfd eabc dgbfce eb gceadf egb agdec gbade | cfgead gefdcab bdcgae cbae
+bafcge edfg abegd deabcfg dfbagc abcde dg bdg gbdaef febga | bdg fdeg dg cafbdg
+cgfdba gec gdeafbc cfgead ce fbegd cdae facdg afcbeg edfcg | cbgfea cfgadeb gdabfce egcdaf
+cbfgad bceagd dbf cdbfae ebdcf cdegfab cbaed gcedf bf aefb | aefb dcfbage bedfcga fb
+cgd bcdafe dacbegf adecb dbfeg bacg gedbc gc fcegad agbdce | cdg fbdge ecdgb eadgfbc
+gfdabe cfbga ceab eaf gefcab gcaef ea efcdg dgafcb abfdegc | ea cafbdeg fgcab acgfe
+dfg gdfbe gf ceagdf aefdb fcbg begdc cgbdef cabged becgafd | fdbgce eadbf cgedb fbcg
+fdeba ecdfa badgef ebagf abegdc dgfb bd febgca agfedbc abd | bd bfega bedgca cbaegf
+bafcdg cegb acfbg feagd fdacbge be bfegac abe bdcaef afebg | be bfecdga defcgba be
+bafgdc dbfag gfecdb cbf cf bfadge acgfb cgfdbae bgeca cadf | cf bfgcde gdaefbc cfb
+gcdbaf cgbedaf ad ebfagc daef dbafec caedb bgcde bfeca abd | ebdagcf dfea fcaedb cbfgad
+ceagfd eadfb fdeag dcgfe gea ag dagcbe fcegbd fbdaceg fcga | gfca fcga dcgefb gfcaebd
+cdfbge dcafe df fcd badce gdaf agcfe ecagbdf eafbcg fgcdea | gdfa fcd eabfcg fd
+ad bgdfae eagfd fedcg dagb gdeabcf dea bgcefa abgef fdbaec | afbge eacfbdg bgecfa fabge
+adfbceg edcgf gcabd egfcbd ecbf cebgd cefdga be deb fedgab | fecgd gcdef ecfdbga daecfg
+gdfeac afedc agdbcfe ae begcfa edfbc bfcgda dgea efa cafdg | abdcfge edag edfbc cfdga
+cbdeg geafbc fd gfacdb fgdce fecgad feda dfg aedbcfg gcafe | fdecg fade fade cadefbg
+af bcfeg gbcfda cgabfe ecgfa abef cgdae beagdfc gaf gebcfd | gdfecb afegbdc gfa gaf
+bgafcd becfag cbdeag bagdc eb bdegc adbe cdfebag gbe egfcd | edbgac adgbc bge cefgba
+dfcebg cgdaef ga fcbgd dgabfc debaf acgb agfbd defbacg gad | bagc bdeaf bfgdc abcg
+ebgfac agfdceb cdbga dafc cfabg dc gebda dcfbeg dbc gafcbd | gfbdca fdac gdfabec bagfcde
+egbac efabgc efagcdb abedg ead da dbac bedcga cegdaf gdfeb | dabcfeg gcfeda adbc ade
+acgbfe eafdg dbea bfgea dgbcaf cedbagf dfgabe cdgfe gda da | gfebdac agd dgaef dga
+edbgf ced bcdeaf cdgeaf bcfgade fbcad eabc cdgfba ec febdc | dcbef faedgc edc begfd
+ca bedcaf cbaedgf edabf cab dfbca bdfgc cfea daegcb gbafde | ac cdfabe bcgdf gdfceab
+bdef gecbfd gbdcf cbaegf cgbda dfc gdefacb fcaegd fd gebcf | cfd dcf df fegdcab
+bf adfgce dcbea cfb gfdaceb cedfbg cfedb fcedg acdgbf gefb | fb bgfe gebf dacbegf
+defc edfba eadbg feb fbagcde ef dafcb gbfdca egcfab aecfdb | ecdf ef fcbgae fced
+acdbe aegb cdabfge ebdcg fcabd ea gebdca bfcgde gcefda aed | ea ebcgd dbcegfa dea
+dbcfe bfcda cabfedg aefc cdfabg bgedc ebdfac edf fe efdbga | efca face fe cefa
+egdab bgfd gdeabcf eadbc abg bg bacefg fgade cadgef afbgde | bfcaegd dbafge abedg geabd
+ebc egbfdc degc ebcagf gbcfd acbdfg ec fcdeb abdcgef abfde | egdc gcdfb bcgdf ce
+dbfaecg bd bcegdf cfabg dcba abfdg fbeagc fdb cbdfga efgad | bgaefc efadg gbcafe bfd
+gacef dcaegb egadc efcbadg eaf caefdg defc fe afgebd agcbf | cedag dfce cedfgba aef
+gafcbed gdcef bcefad daecf adc daefb cbaf egacdb bgadef ac | dbceafg ebfcad bdacfe dca
+ecbfa fae afgbc cdeafg dcfeb efgcab ae beag gbadecf acfbdg | bagfdc ae feabc edcgfa
+egfac gebaf ac cfab gca gcdef cagedb bfecag fagdbe gacfebd | gcbaedf geacbdf gafcebd cgefba
+fbdgec efbcag acbedgf bac befcg adfbec fgca ca bagce gebad | egcbf ca cfgabde abc
+edafg cabe fcaed ce faegdcb dcefgb fec fdagcb cbdaf cbfaed | acbdef cef ce eacbfdg
+efbcgd ebdgc egacf gebadc gba dabe fagcbde gbcae ab gfcbad | aebd aedb bead cdbfgae
+becag cbdf cebda fgdbea bdgafce ecfda abd adefcb acgdef bd | adbfegc eadgbfc dcegafb bfdc
+gfcadb fega acbeg fgcab ebcda ebcdfg ge ebcfga gabfdec ebg | beg fgedbac eagf eagdfcb
+gecf cbf cbfga egfbac cbgaefd dgcbae fc aebcg befdca bfadg | cbf bgfca fbc fcb
+cedfg adbgef cb bcd cgebd dageb cbegad ceab bgfaecd cabfdg | gbced bc dgefc bc
+egba bdcfg fbe acegf ebcfg eacbfg eb fdebac dgeacf dcgbaef | efgacd bef ebcgf fbe
+agfcbd bafcedg dce bgdfce efbac dgfe begdca de gdfcb dbefc | ced ebgcafd ed bgdaec
+decfa cgbdae bdfce dgcbe bdfg bgdefc fbe bf bfgcae ebcgdaf | fb gabcef efcdb gdcebf
+fbecga efcbg bafgd ac dcgeab eacf bafcg gfdbace gbcefd acb | bfecga efgbdac fbegc faec
+ab ecbagdf fbagec cfedb eagbdc acb agdb ecgda acedb gacfde | acdbfeg dgab abc dgbfcea
+gfdbc begdcf bfedg acgfed cd fcd febgda cfgab cadbgef ebdc | ebcd gdefab ebdc ebafdcg

src/day8.rs

@@ -0,0 +1,108 @@
+fn contains(a: &str, b: &str) -> bool {
+    b.chars().all(|c| a.contains(c))
+}
+
+fn find_bd(one: &str, four: &str) -> String {
+    four.chars()
+        .filter(|c| !one.contains(*c))
+        .collect::<String>()
+}
+
+fn hash(s: &str) -> u32 {
+    s.chars()
+        .map(|c| match c {
+            'a' => 2,
+            'b' => 3,
+            'c' => 5,
+            'd' => 7,
+            'e' => 11,
+            'f' => 13,
+            'g' => 17,
+            _ => panic!(),
+        })
+        .product()
+}
+
+fn decode_digit(patterns: &[&str], digit_positions: &[u32], output: &str) -> u32 {
+    *digit_positions
+        .iter()
+        .zip(patterns)
+        .find(|(_i, p)| hash(p) == hash(output))
+        .unwrap()
+        .0
+}
+
+fn decode(patterns: Vec<&str>, outputs: Vec<&str>) -> u32 {
+    let one = patterns.iter().find(|p| p.len() == 2).unwrap();
+    let four = patterns.iter().find(|p| p.len() == 4).unwrap();
+    let bd = find_bd(one, four);
+
+    let digit_positions: Vec<u32> = patterns
+        .iter()
+        .map(|p| match p.len() {
+            2 => 1,
+            4 => 4,
+            3 => 7,
+            7 => 8,
+            5 if !contains(p, one) && !contains(p, &bd) => 2,
+            5 if contains(p, one) => 3,
+            5 if contains(p, &bd) => 5,
+            6 if !contains(p, one) => 6,
+            6 if contains(p, four) => 9,
+            6 if contains(p, one) && !contains(p, four) => 0,
+            _ => panic!(),
+        })
+        .collect();
+
+    let mut iter = outputs.iter();
+    decode_digit(&patterns, &digit_positions, iter.next().unwrap()) * 1000
+        + decode_digit(&patterns, &digit_positions, iter.next().unwrap()) * 100
+        + decode_digit(&patterns, &digit_positions, iter.next().unwrap()) * 10
+        + decode_digit(&patterns, &digit_positions, iter.next().unwrap())
+}
+
+fn main() {
+    const INPUT: &str = include_str!("../inputs/day8.txt");
+    let easy_digits: usize = INPUT
+        .lines()
+        .map(|line| {
+            line.split_ascii_whitespace()
+                .rev()
+                .take(4)
+                .filter(|d| d.len() == 2 || d.len() == 3 || d.len() == 4 || d.len() == 7)
+                .count()
+        })
+        .sum::<usize>();
+    println!("solution {}", easy_digits);
+
+    let digits = INPUT
+        .lines()
+        .map(|line| {
+            let (unique_patterns, outputs) = line
+                .split_once(" | ")
+                .map(|(s, t)| {
+                    (
+                        s.split_ascii_whitespace().collect(),
+                        t.split_ascii_whitespace().collect(),
+                    )
+                })
+                .unwrap();
+            decode(unique_patterns, outputs)
+        })
+        .sum::<u32>();
+    println!("solution {}", digits);
+}
+
+#[test]
+fn test_decode() {
+    let unique_patterns = vec![
+        "be", "cfbegad", "cbdgef", "fgaecd", "cgeb", "fdcge", "agebfd", "fecdb", "fabcd", "edb",
+    ];
+    let outputs = vec!["fdgacbe", "cefdb", "cefbgd", "gcbe"];
+    assert_eq!(decode(unique_patterns, outputs), 8394);
+}
+
+#[test]
+fn test_hash() {
+    assert_eq!(hash("cefbgd"), 3 * 5 * 7 * 11 * 13 * 17);
+}