08

2021/08/README.md

@@ -0,0 +1,27 @@
+# 08
+
+This was super fun and another episode of "I should have gotten my paper out sooner".
+
+As soon as I realized you can take the statistical approach to decode the numbers.
+
+1. Count all characters
+
+This will reveal the mapping for the letters `b`, `e` and `f`, as they appear a unique amount of times.
+
+2. `a` & `c`
+
+Both appear 8 times. We find `a` by looking at the `1` and `7`. If we identify `1` (cf) and `7` (afc) we can simply calculate what `a` is by difference. With `a` identified `c` is also determined.
+
+3. `d` & `g`
+
+Both appear 7 times. We take the similar approach as in 2.
+
+This ensures a linear time execution.
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>449</li>
+    <li>968175</li>
+  </ol>
+</details>

2021/08/input.txt

@@ -0,0 +1,201 @@
+fcdeba edcbag decab adcefg acdfb gdcfb acf fabe fa eacfgbd | aefb cfa acf cdabf
+adbec fabeg fgda gafedb fadeb cdebgf cfaebdg fd bdf cgfbae | ebdfga fbd bdagcef dfb
+cagefd fegabc gbde fcagebd bcedf gefcd bec cefbdg dfabc eb | gdeb dgbe defcb ebc
+cegbf acfeb cafde ab abfecd ecagfd edbcga adbf ecfadgb abc | degafc gefbc ab adcef
+bc gdeca bec fcab cegfdb edbgcfa gbefda fedba dceba badecf | fdbeacg dgbaef bec cbe
+caebdg gfc gaceb adcbf bgfac gf eafg dfbegc abfcge ebdcgaf | bcfag bdgface fegcba gdbeca
+fedga fgebdc dfb edcagb edcab afbc fdecba dbaef fb aefbgcd | bf bcade bf cafb
+cb cfgea badcge gdfabce bec fedbg egdafb cgdfbe cdfb cbgef | dbfc gecbfd fbdc ceb
+cbfdag fcbgd afbgced cgfab ebfgad agcbef dfg fecdb dcga gd | gacfedb cbfgd dgf gdfbc
+abgfd dgcbe dfbgce acbged eab ae daebg edac gdbfcae cgbeaf | bcedg eba eab edac
+gea ag cfaeg agcd befagd fcdae adcgfe ecbgafd cdbfea gefbc | bdeafc defacg gae dgcaef
+bfeca adfbce febd beagc cdeafg fgacedb efc dcbagf abcdf fe | agedfc cefba ef fgcbeda
+cbeafd gfabd dabecg cfeg dfc gcadf cgaed efacgdb cf gfcdae | cefg fgdca decagfb ebfadc
+fg edabf gbedf gedbfa ebafcg egbdacf fgad cedgb cdebfa egf | bgdec egdfab gf acfgbe
+cfe bacge ecfabd dcbfega defa cdfba defbcg fe feabc dbfcag | cabge ef fadbc eafd
+ag gadb edacfb gcaefd eafbd dbeafg efcgdba fag egcbf gfbea | agf gbfcdea cbaefd ag
+adegb gbdfe bcdafge gdfbce fcgeab geafbd ga dgfa age ecadb | ag gae gfda eag
+beagdfc faedc caegbf fgeba caefg cg ceg dbgfae aebgcd cfgb | ceg bgefca egc gce
+dcaf cd cdeabf cefab fgbde efbdc bcd eadcgb gebcadf caegbf | eacfgb cd feacb eafdcbg
+begadcf dbf ecdbg aedfc fbae cdfbga dcbaef bf deacfg cfbde | feba eafb bf cdfbe
+fbgced gcedba gbc fgadc gafcdbe cebf egfbd dbafge cdfgb cb | gcb begfd dfbaecg dbgfc
+dbcega beg gb cfdeba gaceb gfeca gdab fcedbg beacd cfagedb | cfbgade bg bg fdgcbe
+abdcgf agebc dacbg fbadce fcaged gd fdcebga cfdab gbdf dag | gd cefgdba dgbf fbdg
+gb ecbadf gbad edfgcb bgf dbcaf afbcg cgfea cdfgbae dcfbag | gb bg bgfceda dafcbe
+gaefd cg adbfce bdfecg fcbdgea cbafe agefc cgf abcegf gabc | gcf acedfb febgca cafbdeg
+deacgfb bfeacg ebgcdf dc cfadgb abegd gbcfe bcgde gdc dfec | gcd begad befcg dgc
+cdge dfebga gcbef abdcfe ec gebcdf cbe cedabfg fgdeb bfgca | ebgdfca ce fedbgca fdaecb
+bfde aeb aebfcgd gabdfc dgafb bfage be dfgeab fcega gdaceb | edbgac eab eba gaefc
+dcgae afebcg eabcgdf bg agb febda dcbg eagcdb abged edfcga | egcad cgdb deagb gb
+fdceag dbgca beg cegaf begcfa baef eb abgce adgebfc fbgdec | be eb afeb eb
+beadgc gdcf ebacf acdefg bfgdeca afcge dafgeb gf fga daegc | cdgf fg aecfb cbfea
+gfca gfdcabe ecg gc abecdf fbcea fagceb ebfdg efcbg dabegc | dfgbe gdebf cefbag ecafb
+feadg gbfdea acdefb gaebf cfged ad beagfcd dae ecagbf bagd | ad cgabfe cfdaeb dbga
+bcdge adcfeb cadbge bgdafe dbg gcedf acbg ebacd gb dcgeabf | abcgdef ebgcda bdgec bdcaeg
+cfga gacde fdgea cgefbd fgaedc cbadfge gc edbac gebdfa dgc | gcd cgaf eagfdb eagdf
+bg fdcega bgf dbgfcea gdcfe gbcaef bfged dbcg cdbgfe dfbae | gcbd ecfdg fbgde bfg
+gcdabf bgafe dbe eafbdc ecagfdb bedaf gadebc cdfe fdcab ed | dbfea gabdcef de gbdeca
+bcdaf gacfd deacgf bd gbdc adb aecfb gfcbad fdagbe edgcfab | eagbdf bgcd afbdge dab
+gface cbea cfegad bfa ab fdgbc acbgf ebdfga dbcafge cebfga | eagbdcf dacegbf ab ceab
+eabdf bcgafe gfedbac agcdbe gedcb abecd gcad ac bac cedbfg | deacb cab bdcfge dcfgaeb
+cedgf cbgdef gcafde fdae ebgfac edagc cae ea bdefagc bcdag | defcg gebdcf aec bgdac
+cdbae edf afbegd fgdebc aegfcb aebdgfc febcg dcfg df ecdfb | debagf df fcgd eadfgb
+adc fedcbga ad adgb ecagdb dcebg cgead dfgbec eafgc afcdbe | cda bgda ebdafc egbcfd
+cdfeb eafcdg acfde bdac edb gcfeb eagdbf db afdecb ebacgfd | abcd abcd db gbefc
+cdefa bf dcbag cdabf bcefgda ebcadg debfga afb bfcg cgabdf | bf gcabd bdagfec gfcb
+ecb eabgdc cgaeb bcagfd gfedcb beacdgf aedc ec beafg dgacb | gcdfba fgcbead ce ce
+fcebg gcfdeb bdgaec bfdg facged cbg egdcf facbe bg badfgce | fdgb bfcge fgbd egbcfd
+ebfcg bd adgfce acgbdef fegdb fbd gdba gbeafd fbacde agfde | cfbge db gdacfbe abfgde
+bgefc gcde afgcbe dgcfeb eadcgbf dg fbdeg gafcdb bdg fbade | dcgabf bcfdga egcd gd
+fbgadc gcb fcbagde bgaef bc cbdf fcgade cagbf bgaced gfacd | bcg dcebga cdgfa bcdf
+cgebaf egdac aefbdc cbafg becag bfge eb adbfegc ebc bdagcf | be bec egdca cabdgf
+fgd afgdce dg dage decgfb fcdag bcafgde gfcae egcafb fabcd | fcbdaeg gfcdbe agde fgd
+cbfga abg dgbfea dbafegc fceagb ba cfgea bcea gbdfc fgdeca | bcea bafdceg egafc cbdgf
+ebgcda acfegb gbdc befdcag fceadg afdbe cegad ebdga ebg bg | dfebgac dfeab gb gb
+bacdf cgdfae abc ecdaf agefcb ebdc dfbag cb cgfbdae daefcb | bc gcdafeb bca gcfeda
+fegabd egbfa gfa debag decfagb becfa cgadbf defg fg bgdeca | gfde agdcfb bgdcaf bafeg
+gf cbeafgd gedbaf cbfdeg egcfb cfbae gef cfgd egdcb gbdeca | gf fg gef dagcbe
+bac agcbd ba edcga gdfbce abfd egfbca fbgcd bacgdf becadgf | cfbeagd bdfa adbcg badf
+gd cdgeb aecfgb egcabd dcbagf ceagb ebcfd adge dgb gfbdcea | ebfdc deag ebfcga fabcgd
+dcbae agec dacebfg ebdag beacgd afcbd ced decfbg ec dfgeba | gdebcaf dbaegf ce aceg
+dagefb fbecgda adgec afcgde gacf bcdef fa efa cfead geadbc | dfebc bafcdge efa aef
+gbdae cgad bfcde ac dceabg bdgefa bfcaedg cab debca acgefb | ebacdgf abcgedf cab cefdgab
+dbegf adegbc gefdba acbgfd ebfcg gfbad deb edfa ed agedbfc | bfdgcae debgaf bdcgeaf gebcf
+fcgeb dagebc acfeg aecdfbg gedbaf bcgefd dfbeg bc bfcd cgb | cb efbgd cbg bc
+dba gcdbfe egabdc aedbfc fbced bgacf cfbdeag ad faed cbafd | cbfad ad ad cbfga
+edbcag ea ade cfbed fcdag gdaefc eafg faecd fdceagb gfbdca | bgadcef ae eafg ea
+eafbd gfbeda bc dacb fcbega bedcf debfacg edgfc cebafd ceb | dgbecaf gcedf bdca cgabfe
+bacegf deca gefbad adebcg gbcae gbacedf dgcbe ed cgdbf edb | bde ebd efadbg ceda
+dca acdfe bfegac fbeadcg deab dcgfe da acdbgf fbeca edcabf | deacbf dca cdbfage dac
+febg ecfdab abe deagf efgdba gcabd fdegca eb egfacbd dgaeb | cfedga abcefd efagdc bea
+fed feadc ef aecbdf gadbce cgdaf gdcaefb dbgefa bfce debca | dafec cdaeb fbec ef
+fecbdg cefdb gcbe cabdfe cdbgf gb cebafgd agfdc dbg dafgeb | ecbg cgfad cgdaf agdfc
+feacg cgfeda fbcagd fcbge cfa baegdc acegd gfadebc eafd fa | begfc fa afc dbagcf
+afgcbe cfg cf cfde cgfbd gbdfeca gbedac debgc egcfbd gfdab | cf cgfebd cfg fbegcad
+adecfgb bgdcea cbegaf efcbad ebg ge bdeac bcdeg fbcdg dega | dbcgf agde bfcega bge
+cg cbag dcg gdcfae dbfgcea dagefb cgabfd fbgda dgbcf fecbd | gdafeb dgc gc dgfabce
+cdfea dfbcg ga gac eafg adefcg acfdbeg gadfc cfedba edgbac | eafg cag bfgcd cdbgf
+dbaefcg cfdea eadgf dcba cfbaed befcd ace ca abgecf cfdebg | gbdface cegfdb edagf ecdbf
+dcf fcagd gcbf edbgcfa cf baegfd ecgad fedabc gfadb dcagfb | bgfc acgde cf fgbacd
+bg fedgc bfcega dbaegc gfacebd decbg gdba bcafed bedca cbg | dcefg bg bg bg
+geadcf ecfbd bagedc afcdb gcfde cefgdba bce begf be fdcebg | fgeb fegb cgedf ebc
+gbdcaf acgfed gc dafcb cag fbgea cbfga cbfdea bgdc dcfegab | bcgd aedgfc gfeba cg
+efdga afe ea gacbdf gbafd ageb dfaceb aedbfg dgfec bagfcde | fegdc dagfe ea egba
+bfg gf edabg fecbag abfgdec gacf acbfe bdecfg facbde fbega | fgaebc befcda fg abfge
+fceadg beacf cgbdae bgfd cedbf ecfdbag fgdceb edf bdecg df | cfabedg fed dfe gdbf
+fdeac dgfaeb dgfb gfadceb ceabdg gcebaf bf baf daefb aegdb | bdfg gdeab dbgacfe acfed
+ge cbfeda eag fagde fedab ceagdbf fbge ebcagd dcfga dagefb | cdfga ebfcda cadgbfe dfcag
+egcbadf ce afdgc cdefa abedf ecfdab efc bdegfa begafc ecbd | bcafde ecf ce ecf
+ebc gdacbfe gcefdb abefd dgec ec fbgdc fcadgb fdceb gfaceb | cged fadbceg ce bec
+ace egbdac acdef cafbgd efgdc cfabd ea feab bdaefc ebdfgac | adebcg cfbad ea dcfaebg
+fc bagcfed fdabg acefgb bcf bcgead egbca dfgceb fabgc acef | cfb beadgc begca fc
+cdefa agfecd fbcaed bgdeac gaefc ag eag cgbfe gafd cgbadef | gadf age ag gecbf
+dfgcea dgac egabdfc cfdbae edcgf fegbd cge cegbaf cg adfce | cbdaef gec cfedg cagd
+gcdfb dcbfa bcfgae gdbfe gfabed bafcdge cg cbg decg bfcgde | cg dabegf gc gecd
+bf dcefb fbe edagfb gefcd ebcad cbaf dcfeba ecagbd edbgcfa | bfeadc baefdg efdgc cfab
+debga ebgafd gcdafb cd cgd decabg ceagd egbfdca bcde aefgc | cd acbdgf ebcd cbde
+dfbaegc fgcae bgcead gfaedb cdefgb adfge fd degab def fbda | fcdgbe gbcaed dcegab febcdg
+gde gabcde afcbeg dg ebdaf degbfca cfgd bdegcf fgceb fdgbe | fgedbc dbagec gde eadbfgc
+aebdcgf bd ebdag agceb fegad gdeafb gdb fbed cgbfda cgefda | db fbaecdg eadbg befd
+cebdf bgecda efbdacg af aecfgd adf aegdbf abdef ebadg gfab | bdegaf gafb fbegad abdecgf
+adcb daf afdgce fgdbca gfbdc da bfadg dfebgc gbafe fdacbge | febga dfa dcafeg gafcdb
+bgacf dabg ebadcfg bfgdca ceadbf fecgd db dcb egfcab gfcdb | cabegf cdb cdfge cbd
+bg bedfc bedafc cebdfg fedgcba beg gdbcae adefg dgfbe gcbf | edbcaf fgbc egb cgbf
+abegd ecfbga cadfbg gbdecf adbgcfe ac gabec faec ebfcg abc | ceaf dgbecf bdgcfa efca
+degba begdaf gbdcea ecgd gceadfb bgadfc ecdba bfeca cd dbc | cadgbef gbdea dgec cdge
+ceabgd fcbge cdeba cdf fgecdab fd afcgdb dbcfea dbefc afed | dcebf df fd df
+ebd fgbdc cfbe bgdcef fegad be befdg acbgdef cegdab agcdfb | bed gfedb cefb fgbcd
+deb gbcd ecfbgd cfedga ecbdf db edcgf afbdge cefba eabcgfd | bde bd cfeba gfadce
+afbec bcefd afgec cfaegd fgbace ba deagbf abe bcag dafebcg | cefba fgaedc fbgaed bfced
+fabed cadfbeg ecf afedc gfdac agec facgdb ec cdefga dfgcbe | agbdcef efc dbfeagc agdfc
+gc baedg gaebdc edbfga dabfc dbagc gdec gbc dcfegba cfabeg | agdeb eabdg dbagc gdfabec
+dfegab fgd gadc agfdcb gd cfdbg bcagf edbcf fcgeadb aefcgb | cfabg dgac dg gd
+cagfbde dcbfge bgefd ebdfag af caedb daf eabdf bfgacd egfa | ebcad adegbf dcaeb edgfbac
+fecd gbadf baecdg ebfacg fbedcag ef gdafec egdaf gecda afe | fe fe efdc defcabg
+fgbdac egbca gecfda fgadc gfb befgda bcafg dcbaegf bdfc bf | bf fb egcab caefgd
+fb efcdag gebcd faedg dagfeb cfgadb cfgbdae bfae fdb degbf | gbdef afbe gecbfad adgef
+gdcf abegdcf dg dga cdefba bgcae afegdb deafc eafcdg dcega | cegab eacbg dga gedac
+caegfb gfcad ebcdfg cbdfega gdcbf bf cbf edgcb bdfe gedacb | dgcaf gcdfb bfed edbcafg
+bdcfe fgdbaec ecgafd befgad eafbd adf gabd fbgae ad gfcaeb | bgda ad ad fcedag
+agecfd bcegfa fbecgad fgcad gefdc fcdegb fbgad cga aedc ac | cdfag cegdf gdceaf cdbgfe
+bgd befgd fdbceag db dcgfe cbde dfgcba gafecd dcbgfe gfabe | cdbe egdcbf egfcd dbcegf
+ed gdefc dcegfb fecbg fcdag edg bacedg edbf becafg adecfgb | ed ed gbfcae bgfdce
+fbdagc gabdf ecdabfg caegbd ebgaf cfabde cgfd agd gd dbafc | fbdcae dfcaegb gad gabfe
+fbeacg fbcaged fdaeg fde becfgd agfbe de eabd abedgf acfdg | ed dgebafc agefbd fgdac
+deagf efcad dga dfgeca dcaebf gecd dg faebdgc agefb bdgcaf | dg gbeaf fcbdgea gd
+fb gaedcfb gebda gabdec dagbfe fbdae aecdf fbd gcebdf gbfa | afecbdg bdecga abged bdecgfa
+gb bgedcfa adgefc dbgef deafg eabdgf ecdfb acgbde afgb ebg | gb afgb cefgbda gb
+gb edacfgb cdfegb bgc cgaefd bdga fbeac gacfd fgdacb bacgf | gdacf gdba abdg bfcga
+ce befcag ebdca adgcb aec dgebaf bdefca badfe edcf bfegacd | cbfaed begcfa abegdcf cfde
+ceabdg bceafdg gabfed caef ac aegfb bafcg bfaceg cdbfg cga | ac aedfgb gfecba ca
+gdebf aecf bcgfda fcd gcebda fbcde ecbad gebfdac cfaebd cf | cdf dcbage cf befdg
+fdga df fdbage bdeaf adegb agedcb fbd fbcea dbfgec cfbegad | fd bfdgcea aecgbd agedb
+cbegda agcbfd gbeafdc dacge fgbec bd edfacg bead gdb dgbce | bdg acgde daeb gbafcd
+degcbf fg acgedb cdgbfea adgf bfg eagbd fgbae becfa geadfb | dgaf febag gdeba gdbcea
+fcgaeb aebdg gcadeb cegfdb afdeg ebcfgda dgb cdba bd bcage | agedf eagcb dcgaeb cgfbae
+gbecd abedc fegbcd efgacd fegdab bg bgcdafe geb fdceg gbcf | beg bdgeaf gdfec efgcda
+acbfe cef egfabd afbeg bdfeacg cage gfdcbe ec beagfc facbd | cef fce afebdcg acefb
+da afd gfebdc cadg deafc ecfdg gdafbec fagcde edbafg eabfc | aefbdg ad fcdge dgbfce
+ecgdaf df dbeac fbegc cdf bfedc bacgde dfaecb dbfa bfgdace | defcag bcfed fedcb begcf
+ceafbd ecfgbad afgdbe gbdac fcgbed ebg eg gfae egadb baedf | ge eg gafedb bge
+bf abcdfe afb acdbf fdaebg cdgabe cbfe cdbea dgaefcb gfcad | cagedbf acefdbg febadgc edbac
+aegcdf abgecf abefdgc daefg agbfd eacgd cgeadb decf fe gfe | fe gcafedb fe bdcgea
+be cgfdea bfce fbegd bagefdc bge gbfda fedgc ecdabg bdefgc | begdf dgaefbc bge edbcfg
+facebgd fcge caf agbecf dbafg aegcb dcabeg bagfc fc fcadeb | cf caf fc ecafbg
+fbegca bfegad cafe caegb beagf gfcdab ca cdegb bfdegca cag | fgaeb agc ecfa bfaeg
+ab fceadgb bae gceda afbced gfdeb edbafg fdbecg aebgd bfga | ba ebfdca gfedb dagbe
+abdfcg egcf efd efgacdb fe ebacd dbcfeg gbfaed bdcfg cdbef | cadfgb gfce def geabfdc
+beafdc bgdec efgbac gab gdbcaf ebcga gfea ga cagebfd fcabe | gba cbega gaef eabcfdg
+de fdcegb fcebd afegbc efd bdcfa decgbaf gfecb gefdac dbge | gedb edf gbfec ed
+dbfacge eabdg beg adbcg eg abdfe fbadeg adcbef bfecdg gaef | bedfga bdfae dafcbe beg
+acfbg bfgdea eabcf fagbced gcfd cgabfd gf cadbge fbg acgbd | gfdc bcgfeda acbgf dcagb
+cdeba gfdbce cad acbf gedba ecabdgf cfadeb egadfc ca cdbef | defbgc cdbef caedb acebd
+edfabg ab cfegdb adgcebf eacb dcafb ebdcf efbdac adfgc abd | efbdag abec cfbad ab
+abgdcf fdg fg edfabc dabfegc gfac bdcaf egdcb gcbfd fdaebg | dfbgeca fg bfdgac cgdefab
+gcdafb ce cbde fecgd acgebdf gcbfd aefdg gbfdce gcfeab cef | bced dacgfb dbgecfa decb
+gaecfdb cge dacef cg bgead gcead fbecag cbeafd dfgc fdaegc | dfcg gc agced dfcg
+eb cegfab gdbe ecagfd dafcb decagbf fbe abefd gfead eafdgb | gbafed fgeda abfde be
+gebadf ebfdg bgefdc bdea bafcedg feagc adbfcg befag ba bga | gacebfd geadfb acfgbd bade
+becda dgaeb dg dcefab gbd cgfdba cabged gfabe egdc gafedbc | gabef dgb fcdabg dceg
+aebf bfc bfecg bf febcgad egbafc fgedc eacgbd dafbcg ebacg | aefb gfbaec bf fb
+cdgaeb bdacefg afecgd edaf cagfe ae gbcfa cae bgcfde fgecd | cfdage abdgfce defa cagfb
+bedag gdcbea gfebdca adg dgfbac dg faegcb eafdb egdc acegb | dg efgadcb gdce bcegad
+dacfgbe fg fbace fbgae gef cefbad debga gefbcd ebcgfa gfca | cafg decbfg efg gf
+deca cbaefd fdgebca fca bfdga gbdcfe ac fcbeag dcfeb badcf | adcfb dfcbgae gecbaf eabcdf
+gdabefc ca gbefda aec cafg ebafc gcdeba gefba ecbdf feabcg | cfga fgaebd dcbgae bfage
+ecd fagedc dcaegb efgd febdcga fcade efcgab fgcea afdbc de | gbceda de gefbca efdg
+afgcb ecbdgfa bdgecf ad dgea cadfg afd afecbd cedagf fecgd | beafdc afd geda adgfec
+gbdcfe cdeab fd fecda adcgebf adebgc badf egcaf dfc fbdeac | cgafe fbdeca beagfcd caebfgd
+abgfc gfedabc cb dcefga bdca fcb egbcfd dbgafc dafcg gabfe | acefgd bcf dbgfac acgdf
+facge ecadgb fecdba dfcg fc fac eagfcd bgecfda afgeb eacdg | cdfg caefg fc bdeafcg
+efdgb cebadg ceafbg fadcbg bcafdge fag af efgba cabeg faec | abgce ceaf gaf gbdeac
+cafegb gcadfb begfacd bfad db dbgfc dbc cgfde bgcdea cbfga | gbfadc edabcg agfbec dbfa
+facb acbefdg baedfg fbegca gfeadc bae dgcbe geacf ab gcaeb | ba eba baegdfc ba
+edfgba gbfed dfc afdcebg cd cbdef fbaec gedcbf gcdb dgefca | gfbade cbdg dfc cbgd
+bfc fgcbda dgfecb dbegac gcaf afcbd dcbfeag dagbc adbef fc | afcg afgc fcb gbedfc
+dfagb edagbfc dceb agebcf bc gaedfc fbc cfbaed fcdba adecf | bc cb ecdfba bdec
+gc cgdfbe agcb bfgdcea egacfb gefdba dcfea fcg fgeac aebgf | fbgdec cbafge gbac befga
+fgdac agfbed ec bcegfd eadgbc gdcae gdaeb abec ceg bcdgfae | fgcad dagce adfcg ec
+gfcad aecbgdf feacgd ceda fgdae fca ac bagedf acfegb cfbdg | acf afc fac ac
+agcdeb ga aebdgf bedfgc age feadg cadfe egdbfca efgdb gfba | edbgac fdeca acedbg cgbdfe
+gfdc acebf dce adgcbe egcdaf aedgfbc gfdae afgbed aedcf cd | gadcef dc fdecag aegfdb
+agcdeb gdfc gebdc bcaegf cf dabef cfdegb ecbfd aecfdbg fbc | fbc debfc gecabfd gedcb
+aebfc aecgf cb daegcf dbaecg cbdgafe adfeb bce bfgc bgcaef | ceb fbgc cbgf bdcefag
+egfdab cefbgad cbfdea gdea egbdf bed de gbefc gbfad gbfacd | eacdgbf agbfdc dgcaefb de
+adbfce be afcebgd fadbc bed dfaeb badcfg acdebg eafdg cbfe | edb cbfe fdgeacb deb
+bad feab cfdga fcgdbe dcfbe gedacb cadbf becfagd dbeafc ab | efcbgda aebf bdcgafe abef
+dbfeg dfbecag dace cfdbag gcabd cegdb egafcb ec ceb debcga | bce ce adbecgf abgcd
+cabdgf dea abcgd abfdeg acdbge befdgac edacg fegdc abce ea | edacg gedcf dceag bagdfc
+aceg ac bacgfd ceabf fcaegb edbgfc dbfea bgecdaf ebgfc acf | agce ac ecbfa agfbecd
+bgcfda egc dbefcag befdg ec aedc cadfeg cgdaf gefcd fcageb | cebdagf dace ecfdag bcdaegf
+bfdgc gbe acgef gbcade be egfcb afbe bacfeg dfbgeac gcfaed | abfe gfcbd fbgeac dcgbf
+efcbd adegbcf agefdb cdabf bedgca abgdf dgabfc ac fcga bac | ac abc debgac fbdgac
+ebgacd fd bdface cabdf dfa gfcab gbeafdc ecfd ecbda egfdba | fd df dcef fd
+cbadge geb cfdge bg bfeca bgecaf edcabf gcbfe afgb efgdabc | fabg gabf gfbec afebc
+fedgabc cbedg fcaegd ecg dcfgb ce bdfgae gaebd cbea ecdbag | efcbagd bfeagcd ce ce
+gebdcf cdbfga fead aedfcgb ad afegbd gdfbe bedag ecagb agd | ad bfcagd ceafdgb fcgadbe
+fdegb egdbfc cegfdab dacfge dge gadbf edcfb edcabf egcb ge | edg bagdcfe egcb ged
+ad cfbeag adb efbad feabc acfd cgdeba fdacgbe dgefb feadbc | fabce cfbega defbca bad
+facbge cfabd bgcafde agdb fab becdf cfaegd dafgc agfcbd ba | cbfda ab cbfdaeg dfagbc
+eg dgaebc dfcgab cdgfe edfcb adcgf cedagf geaf bacdefg gde | dfcbe eagf agdecf ge
+

2021/08/python/main.py

@@ -0,0 +1,169 @@
+#!/usr/bin/env python
+
+from os.path import join, dirname
+from typing import Dict, List, Set
+
+# Day 08
+
+# Common
+
+
+def read_input(filename):
+    data = join(dirname(__file__), '..', filename)
+    with open(data) as f:
+        return f.read().strip()
+
+
+test = read_input('test.txt')
+data = read_input('input.txt')
+
+
+class Utils:
+    @staticmethod
+    def count_chars(items: List[str]) -> Dict[str, int]:
+        count = {}
+        for item in items:
+            for char in item:
+                if char not in count:
+                    count[char] = 0
+                count[char] += 1
+        return count
+
+    @staticmethod
+    def group_by_length(items: List[str]) -> Dict[int, List[str]]:
+        groups = {}
+        for item in items:
+            l = len(item)
+            if l not in groups:
+                groups[l] = []
+            groups[l].append(item)
+        return groups
+
+
+class SevenSegment:
+    mappings = {
+        0: 'abcefg',
+        1: 'cf',
+        2: 'acdeg',
+        3: 'acdfg',
+        4: 'bcdf',
+        5: 'abdfg',
+        6: 'abdefg',
+        7: 'acf',
+        8: 'abcdefg',
+        9: 'abcdfg'
+    }
+    reverse = {v: k for k, v in mappings.items()}
+    count: Dict[str, int] = Utils.count_chars(mappings.values())
+
+    @staticmethod
+    def encode(number: int) -> str:
+        return SevenSegment.mappings[number]
+
+    @staticmethod
+    def decode(segment: str) -> int:
+        normalized: str = ''.join(sorted(list(segment)))
+        return SevenSegment.reverse[normalized]
+
+
+class Reading:
+    def __init__(self, input: List[str], output: List[str]) -> None:
+        self.input = input
+        self.output = output
+        self.transformations: Dict[str, str] = {}
+
+    def translate(self, segment: str) -> str:
+        return ''.join([self.transformations[char] for char in segment])
+
+    def analyse(self):
+        count = Utils.count_chars(self.input)
+        by_length = Utils.group_by_length(self.input)
+
+        # Find a & c
+        # 1 and 7 have the same chars with the only difference of the 'a'
+        one = set(by_length[2][0])
+        seven = set(by_length[3][0])
+        a = seven.difference(one).pop()
+
+        dg: Set[str] = set()
+
+        # Find b, e & f by statistical analysis
+        for k, v in count.items():
+            if v == 6:
+                b = k
+                self.transformations[k] = 'b'
+            elif v == 4:
+                self.transformations[k] = 'e'
+            elif v == 9:
+                self.transformations[k] = 'f'
+            elif v == 8:
+                if k == a:
+                    self.transformations[k] = 'a'
+                else:
+                    self.transformations[k] = 'c'
+            elif v == 7:
+                dg.add(k)
+
+        # Find d by looking at the 1 and 4
+        # We already know b so, we subtract cf (1) from bcdf (4) and are left with bd.
+        four = set(by_length[4][0])
+        bd = four.difference(one)
+        d = bd.difference(b).pop()
+        self.transformations[d] = 'd'
+        g = dg.difference(d).pop()
+        self.transformations[g] = 'g'
+
+    def read(self) -> List[int]:
+        return [SevenSegment.decode(self.translate(segment)) for segment in self.output]
+
+    @staticmethod
+    def parse(data: str):
+        input, output = data.split('|')
+        i = input.strip().split(' ')
+        o = output.strip().split(' ')
+        return Reading(i, o)
+
+
+class Log:
+    def __init__(self, readings: List[Reading]) -> None:
+        self.readings = readings
+
+    def flag(self, alt=False):
+        count = 0
+        for reading in self.readings:
+            reading.analyse()
+            numbers = reading.read()
+            if alt:
+                count += int(''.join([str(n) for n in numbers]))
+            else:
+                for number in numbers:
+                    if number == 1 or number == 4 or number == 7 or number == 8:
+                        count += 1
+        return count
+
+    @staticmethod
+    def parse(data: str):
+        return Log([Reading.parse(line) for line in data.split('\n')])
+
+
+# 1
+print('1.')
+
+log = Log.parse(test)
+result = log.flag()
+print(f"Test: {result}")
+
+log = Log.parse(data)
+result = log.flag()
+print(f"Result: {result}")
+
+# 2
+print('\n2.')
+
+log = Log.parse(test)
+result = log.flag(True)
+print(f"Test: {result}")
+
+log = Log.parse(data)
+result = log.flag(True)
+print(f"Result: {result}")

2021/08/test.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