diff --git a/source/app.d b/source/app.d index cd6faff..e5df07b 100644 --- a/source/app.d +++ b/source/app.d @@ -1,7 +1,7 @@ import std.stdio; -import day7.part1; +import day8.part1; void main() { - crabFuel(); + sevenSegmentSearch(); } diff --git a/source/day8/input.txt b/source/day8/input.txt new file mode 100644 index 0000000..93e8577 --- /dev/null +++ b/source/day8/input.txt @@ -0,0 +1,200 @@ +gfeabcd adecfb gcedb cef efgdc decabg cbfg edfga fdegcb cf | fc faedg fdage fec +bcfegd fdceg ecgfadb fdae af cdeagf afc abdgc gcadf gfbace | cefdbg afgedc bcagd gedcf +gbf bagdec fgdbae cfbd bgacd fb fbcaegd dfgbac gbfca gecaf | gadcfb abgcf bdcgea gbf +eagcf cdgbaf cbadg fbcdgea cebfad fb fdgb abf gcdbea cgabf | bfdg dgacb gacef bafcg +bgface cfadb gfc gcfba febg aedcgfb bceag cdgaeb adfecg gf | acfdb fabdc efagdc facbd +bfegac adbfg ebagf beafgcd gfeadc age cgedbf gfceb eabc ae | acbe gfcbea aefgb abdgf +bfeag cbae cbg bc cbaefg cfdga fgdbec ebadgf eacgfdb gabcf | bfgcea eabc eagfb bc 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dagefbc | debgc dgaceb gcd fdebca +cega gdbefac gfdcb efbgca ga afg cgbaf aecfb ceabdf edgbaf | fedagb dbafce ga ga +efbadc acgde fagcde fe dcaebg edfg acgef cbagf fae acfebgd | ef badcef dfge gecfa +cbgfa cbae dabgef ba bag fcgea fdcage gfbcd cgbdaef gfecab | aefbgd bfgac gebacf bgfac +dgfbce fgc bfcda egdfa gc fgedab acgdf acedgf aegc fbcgade | dfagc bgdafe aegfd egfda +dgfa bedfc badcf agfbcd af eadbcg bfegca bfa cgabdef bgadc | bgdacf dcfba fcbda gbedafc +aceg gdaef fcbegda dcefab afcedg abgdfc cadef agf degbf ag | bdgfe bacfgd cadfe fcgeabd +bgefcd edg acdegb edcba cbdefa cfaeg beacgfd egcda dg dbga | efagc abcdegf adfceb dg +faedbc gabde becfgd caebf acfg eacbg cgabfe cdebfga gc gcb | cdgebf cefab abdfce gdcefb +de cgdfb edbg dbacfge cdfeg cebdgf agcef afbcgd dce dbfcea | beadfgc gbcadf dgcef degb +egcafb cgadfbe gdace fd bafce cedabf bgdefa dcfb afd ecafd | gaefbd dfcb aebcf gcabfe +cb beafcd bdgacf cdb bgac edgbfac cgfed bcgfd bgfdae gdabf | bafdg gcba fbgcd cegdf +fceba ag 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bcgdfe bgcde bedac cgbefa bcgfe | gbd aedcb ecfbg ecdbg +gcafedb ecdbfa fedcg dcefga dfgca gbcde gfae ef fec bdfcga | fdgcabe cbadef fcgda ebdgc +eca ea fbadec debcg agef edcga caedgbf fadgc dgafec cfbgda | cbdeg cedgbaf aecdfb dcgea +afc gbafec egbdfca ca eagbfd aecgf abfeg gcba abedfc dfgec | gafbe cedafb afbeg cagfe +agbde eabcgd fe dcfgb efd becdgfa dfageb fdebg fdcage bfea | def edgfb acfedg bgead +gbdec facbgd ag gba bgceda aedcbgf eagd cgabe bface fbdecg | eagbc gcbdfa bafcgde eacbf +dbacfge cagfdb geba cefgda bgc eacgf caebfg cbdef bg fcbge | bg abcegf efgca cfdeb +gaefc cgefdab fdcaeg aegfdb gb badfc gbf bcfag gbfeac gceb | bdafc aefgdb gfcae dfcab +dbceg bcafgd cfabde cfabdge aed ae deacb face egfbda bfdac | cgabdf fgeadb ade dcbge +dfbgcea fbeca cefbg dfgc bgaefd dbecga gfe fg efdgcb cdbge | gcbfed cfbeg gdfecba gecbd +gaced bd edfcag aecdfgb bgad edcbg debfca deagbc bdc egfbc | bdc cdb efcbad dagb +egfca bgea adebfc gfceab cfebg cdefag dgfbc bgadecf ceb eb | dcefag facgeb edbfca eacfg +fged bcaeg fcgbde gdfacb fcadbe bfcge ebfcd fcg edabgcf gf | gfbdac efcdb gfceb fgdceb +fgbdeac facdb agcf fc bfegcd bedfa gbcda bcdfga fcb degacb | bgecad cf dcgbfea gfca +dafbgc cfdga dgafeb db cfdage bcfaedg fbgec bdf dcab cdbgf | cfdgb befadg ebgfc acdbfg +eadgf gdefab ebacd fc eafgcd caf deafc egcf dacbegf bfdagc | egadcfb agfdcb debca fdcagb +dgaecb efd gbecdf fgdcae geaf faecd dfcab bcfagde egcda ef | fe ecagd efd fed +dbaf bf bfg ebfcga degba cedfg adfcgeb edgfb begafd daecbg | cbegda cbeadg fbg cgfde +gdebcfa cbfad ecgfd fbeg dgfbc bg gfcade gdb gdbecf gdbeac | fdcgbe begf acgedb cbdfg +acfdge cadgbf gecfd dbefc fg agcebfd cfg gedac adcbge efag | egaf cbdgeaf gfc bdfgca +fbgad eabg bcdafg bde edcfab fdgec degbfca badgfe dbgfe be | egbdf bgadf bfdge edgfc +gfceab acf ceafbd cagdbe bdaf dcfae af febacgd fgdec daebc | cegfd dacfbe faebcd adfecb +bgefcda facgb bcg fgec cgebad gc efagcb bdgaf fecba dcfbea | bfeac acgfb ebcaf bgadf +eagbd abcgde afedc gcbe bac debcafg bgacdf bc dbcae gadbef | cba adcfbeg efdac cb +fbead gdebfa cabge adfbgce dcb dc aebdc dacfeb dcfa gbfecd | decfba cd dc edcgfb +gcbae ecfbag gebcf edabg efagcd cga ac beagcdf bcfgde fbac | fgecb gdabe agc ca +dfgacb fadbg afebdg acbgefd gdbc cgafd efgac cd beafcd fdc | daebfgc cebfad bgdeaf dcf +cfdeab efgadc cfbag ef cagbed dbcea ecfab cfe befd gecdfab | fgecdba cabde abefc dbcae +fadec cbgade acbfe df cdf acfdeg afdg gabcfed acged bfdcge | efcda ebfca ebgcfad dcage +cdfgeb eabgcdf faegc facgbd gdc efbdac fdbca fdgca gd badg | dfbceg cfdba cfgda bcadf +cdeafg ecfbgd cb eabc aegdcfb cdfba bfc cdfeba edfac dagbf | ceafdg feadc fbegdc beacdfg +acfbde agc cabgf cfdba gfecb bgadce bcgfda fadg cebdgfa ag | cbfad cebfagd agdcbf dcabf +dfeag fgbedca dfceg fcgaed egdcfb edbcga aefc gfadb aeg ae | gefda gabfd egacdf dfbgec +gfbec bdcaegf cdb bdacgf dgcbae gdcaf cfdage bd badf dbfcg | gaedbc dcb fcgdb afdbgc +cgdef geafc fd fdgbac degbc dgcefba cfeabg dfae cafdge dcf | egbcfa defa df dcf +cafed gdbfa cbfade cfgead cb gecbfd gdbcfea bcea cfb bacfd | bcea afdbg cbegdfa afdcbge +ac fcdgeba gdfec bdgefa fedab eac fadce aecbgf dbac aedcfb | efgabdc cafde bacefd cfeagb +begcf eagcdbf cfg bdcfea bfeca cfdagb bfged caeg cg acfegb | bgfde dgafceb dcfeab dgacfb +gbdfca fadbg fbc cb bdfgae abgcf feacg dfabceg dabc cfgdeb | cbf fcgdeb eafgc bdfgea +fcaegbd abgdce fdcgab gf bfgcae bfg gbfea abgce fgce ebadf | fdabgc gcfabe aebgdfc gbdcae +cdagbe gedbacf efbcad ebdag be gbcfad gbdac ebcg ebd egfda | efgda ecgb gbecda bdfgca +bfdgac gdecb abcde daefc efbgcd ecdbga agbe dab ab cfgabde | ebga ab cgbfad eacdb +efgda ac acf dfgbec dfeac edfbc ecfdgba fceabd bfdcga aecb | ecadfgb abcedf cefad cabe diff --git a/source/day8/part1.d b/source/day8/part1.d new file mode 100644 index 0000000..215b4ce --- /dev/null +++ b/source/day8/part1.d @@ -0,0 +1,114 @@ +module day8.part1; + +import std.file; +import std.stdio; +import std.string; +import std.algorithm; +import std.typecons; +import std.array; +import std.conv; + +struct Entry { + string[] signalPatterns; + string[] outputValues; +} + +Entry[] readEntries(string filename) { + return readText(filename).strip.split("\n") + .map!((line) { + auto parts = line.split("|"); + return Entry(parts[0].strip.split(), parts[1].strip.split()); + }).array; +} + +ulong count1478(Entry[] entries) { + return entries.map!((entry) { + writeln(entry); + return entry.outputValues.filter!(v => v.length == 2 || v.length == 4 || v.length == 3 || v.length == 7).count; + }).sum(); +} + +int decodeEntry(Entry entry) { + int[string] knownSignals; + string[int] knownSignalsInverse; + + void registerKnownSignal(string signal, int digit) { + knownSignals[signal] = digit; + knownSignalsInverse[digit] = signal; + } + + // First we register all of the basic signals that will be used to identify others. + foreach (signal; entry.signalPatterns) { + if (signal.length == 2) { + registerKnownSignal(signal, 1); + } + if (signal.length == 3) { + registerKnownSignal(signal, 7); + } + if (signal.length == 4) { + registerKnownSignal(signal, 4); + } + if (signal.length == 7) { + registerKnownSignal(signal, 8); + } + } + + bool matchesCount(string signal, int knownSignal, int requiredMatches = -1) { + int c = 0; + if (requiredMatches == -1) requiredMatches = cast(int) knownSignalsInverse[knownSignal].length; + foreach (segment; signal) { + if (knownSignalsInverse[knownSignal].canFind(segment)) c++; + } + return c == requiredMatches; + } + + // Register all other signals using the ones we registered in the first pass. + foreach (signal; entry.signalPatterns) { + if (signal.length == 6) { + if (0 !in knownSignalsInverse && matchesCount(signal, 1) && matchesCount(signal, 7) && matchesCount(signal, 4, 3)) { + registerKnownSignal(signal, 0); + } + if (6 !in knownSignalsInverse && matchesCount(signal, 1, 1) && matchesCount(signal, 4, 3) && matchesCount(signal, 7, 2)) { + registerKnownSignal(signal, 6); + } + if (9 !in knownSignalsInverse && matchesCount(signal, 1) && matchesCount(signal, 4) && matchesCount(signal, 7)) { + registerKnownSignal(signal, 9); + } + } + if (signal.length == 5) { + if (2 !in knownSignalsInverse && matchesCount(signal, 1, 1) && matchesCount(signal, 4, 2) && matchesCount(signal, 7, 2)) { + registerKnownSignal(signal, 2); + } + if (3 !in knownSignalsInverse && matchesCount(signal, 1) && matchesCount(signal, 7) && matchesCount(signal, 4, 3)) { + registerKnownSignal(signal, 3); + } + if (5 !in knownSignalsInverse && matchesCount(signal, 1, 1) && matchesCount(signal, 4, 3) && matchesCount(signal, 7, 2)) { + registerKnownSignal(signal, 5); + } + } + } + + bool areStringsPermutations(string a, string b) { + if (a.length != b.length) return false; + foreach (c; a) { + if (!b.canFind(c)) return false; + } + return true; + } + + int[] resultDigits = []; + foreach (outputValue; entry.outputValues) { + foreach (knownSignal, digit; knownSignals) { + if (areStringsPermutations(outputValue, knownSignal)) { + resultDigits ~= digit; + break; + } + } + } + + return resultDigits.map!(digit => digit.to!string).joiner().to!int; +} + +void sevenSegmentSearch() { + "source/day8/input.txt".readEntries.map!(decodeEntry).sum.writeln; +} \ No newline at end of file diff --git a/source/day8/test_input.txt b/source/day8/test_input.txt new file mode 100644 index 0000000..42b3bfd --- /dev/null +++ b/source/day8/test_input.txt @@ -0,0 +1 @@ +acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab | cdfeb fcadb cdfeb cdbaf