alan day8 erlang

diff --git a/day8/day8.erl b/day8/day8.erl
new file mode 100644 (file)
index 0000000..092b8f0
--- /dev/null
+++ b/day8/day8.erl
@@ -0,0 +1,116 @@
+%% to compile: erlc day8.erl
+%% to run: erl -noshell -s day5 solve
+%%
+-module(day8).
+
+-export ([solve/0, solve/1, solve/2]).
+-export ([read_input/0]).
+
+solve() ->
+    solve(['1']),
+    solve(['2']),
+    init:stop().
+
+solve(A) ->
+    solve(A, read_input()).
+
+solve(['1'], D) ->
+    io:format("The solution to ~p puzzle1 is: ~p~n", [?MODULE, solve(1, D)]);
+solve(1, D) ->
+    solution1(D);
+solve(['2'], D) ->
+    io:format("The solution to ~p puzzle2 is: ~p~n", [?MODULE, solve(2, D)]);
+solve(2, D) ->
+    solution2(D).
+
+read_input() ->
+    {ok, IO} = file:open("input.txt", 'read'),
+    Data = read_input(IO),
+    file:close(IO),
+    Data.
+
+read_input(IO) ->
+       read_input(IO, []).
+
+read_input(IO, Input) ->
+    case read_line(IO) of
+       'eof' ->Input;
+       Line -> read_input(IO, lists:reverse([Line|Input]))
+    end.
+
+read_line(IO) ->
+       case file:read_line(IO) of
+               'eof' -> 'eof';
+               {ok, Line} -> parse_line(Line)
+       end.
+
+parse_line(Line) ->
+    [string:tokens(X, " \n") || X <- string:split(Line, "|")].
+
+solution1(Input) ->
+   lists:foldl(fun([_,X], Acc) -> count_unique(X, Acc) end, 0, Input).
+
+solution2([]) -> 0;
+solution2([[I|[O]]|T]) ->
+   [One] = find_length(2,I),
+   [Seven] = find_length(3,I),
+   [Four] = find_length(4,I),
+   [Eight] = find_length(7,I),
+   Three = find_three(find_length(5, I), One),
+   Nine = find_nine(find_length(6, I), Four),
+   [Five, Two] = find_five_and_two(find_length(5, I), Three, Four),
+   [Six, Zero] = find_six_and_zero(find_length(6, I), Nine, One),
+   Key = [{lists:sort(One), 1},{lists:sort(Two), 2},{lists:sort(Three), 3},{lists:sort(Four), 4},{lists:sort(Five), 5},{lists:sort(Six), 6},{lists:sort(Seven), 7},{lists:sort(Eight), 8},{lists:sort(Nine), 9}, {lists:sort(Zero), 0}],
+   [{_, A},{_,B},{_,C},{_,D}] = [lists:keyfind(lists:sort(X), 1, Key) || X <- O],
+   (A * 1000 + B * 100 + C * 10 + D)  + solution2(T).
+
+count_unique([], V) -> V;
+count_unique([H|T], V) ->
+   count_unique(T, V + count(length(H))).
+
+count(2) -> 1;
+count(4) -> 1;
+count(3) -> 1;
+count(7) -> 1;
+count(_) -> 0.
+
+find_length(_Len, []) -> [];
+find_length(Len, [H|T]) when  length(H) == Len -> [H|find_length(Len, T)];
+find_length(Len, [_H|T]) -> find_length(Len, T).
+
+find_three([H|T], One) ->
+   case length(minus(H, One)) of 
+          3 -> H;
+          _ -> find_three(T, One)
+   end.
+
+find_nine([H|T], Four) ->
+   case length(minus(H, Four)) of 
+          2 -> H;
+          _ -> find_nine(T, Four)
+   end.
+
+find_five_and_two(Fives, Three, Four) ->
+       N = lists:delete(Three, Fives),
+       find_five_and_two(N, Four).
+
+find_five_and_two([H,T], Four) ->
+   case length(minus(H, Four)) of
+           3 -> [T, H];
+           2 -> [H, T]
+   end.
+find_six_and_zero(Sixes, Nine, One) ->
+        N = lists:delete(Nine, Sixes),
+        find_six_and_zero(N, One).
+
+find_six_and_zero([H,T], One) ->
+   case length(minus(H, One)) of
+           4 -> [T, H];
+           5 -> [H, T]
+   end.
+
+minus(X, Y) ->
+    lists:foldl(fun(T, Acc) -> lists:delete(T, Acc) end, X, Y).
+
+plus(X, Y) ->
+    lists:usort(X ++ Y).

diff --git a/day8/input.txt b/day8/input.txt
new file mode 100644 (file)
index 0000000..a4de956
--- /dev/null
+++ b/day8/input.txt
@@ -0,0 +1,200 @@
+dcagfb cbegda cabdf bagedf dcb cd dcbegaf aebcf bgdaf dgcf | dacebgf cbafd dbacf cdgf
+dfgbc ceagbd egb cgdae eafcgd ecbgd eb aefbgcd bfaceg deba | baed ecabgd aebd cadfebg
+acbd bagfec bedcf efbca dbfecag gadcfe dc dbcaef cde fbegd | deacfg bfagcde bgedf cde
+dgec dfc fabgd bfcgae dfbcg baegdcf cd fbdace cdbefg becgf | cedg adfbecg badgf dgbfc
+be bacedg dfacb fbge deagcf eba egacf gcebfa febac dbgacfe | befg be egbf aedgcbf
+gafbd gbafce agced fdgae bcedgaf gdeacb efdc eaf fe cgeadf | cgdae fdec fcdeabg ef
+cdaefgb cfadbe gc afgcbe afedcg faecb cabg egc bfgde bfgce | fbaedc gc abgc bfcea
+egcafb adgecf caebf fdgbaec fbaed cebg facbgd cfe fgabc ec | fbgca deagfc ce ce
+fcdab deb cdbfea fecb befcdga abecd gdcae efbgda fcdgba be | cfbad dacge gbdeaf bed
+afdecg gfcadb ecadfbg facgd ed egda efbgc ecd cdegf bfadec | becgf fcbeg de cgefb
+caedbg gcfdba bfdae ge beagfdc bedag gcabd egac gcefbd deg | fdbecg acge bgfacd abefd
+befad ecgad adgefcb febg gb afdcbe dcbfag beafgd dbg eagdb | feabd aedfb gbd aebdcf
+bcfde acbfed dcaf dbcae gacbfe fc dgbcae egbacfd fcb edbfg | gbdfe gbeafc bcf cebfga
+cgbade adcbgfe fb efgbad gbcfde aecfd edgba afbg bfeda fbe | ecafbdg bfdea fgab edfbgc
+cbfa gefbd bcfedga bagefc ab bga ecdgab gbaef gfacde fcage | acdegf gab cegadb gab
+cafbeg dfaebc fdca dgcbe eacbf fde debgfca egabfd dfceb fd | df eabcf egbdc dfe
+egcdfa ebdac fdaecbg ed fdacb agecb cbdgaf ecd efdb dbaecf | dcabf cbeag ebdf ecgba
+gacdebf decfbg afbdg dcagbf cg agdbc agcf ebcad abgedf bcg | badec dcbga cgfa abcde
+fgcad dfebga gdbef ec ebcd fbcgea ceg fgedc defgbac dcfgbe | ce gbdfe fbcgdea fcgbdea
+cgbef afcbeg dgbec ebafcd cgbfeda adbge cd ecd gfcd fgbdec | edc gcebd fegacdb cd
+bafdcg egfdc bcfge dgeabf cd cgbadfe agefd facegd eadc cgd | cgd dcg defbagc cfdbega
+degfcb fdg edabgf cadge fg gfcb cdeafbg bcefd dgfec beadcf | dgcbfe cabfed fecbd cgdfbea
+dbfaec bfcgae cdb cdaf defbcg abgde ceabf adceb decgafb cd | fcda bdc dc afgecb
+cead efcdg adbcfeg fagdc def acegfd fcbagd cbgef ed fgdaeb | ecad fcaedg cgadf cfaged
+egdbfa cbgefad dgacbf cb dfbgec gefbd cbf gefbc gcefa bdec | ebcd ecgdbf fgebc cfb
+fagbe acbged bf eagcf dgaebcf gbf febadg deabg cdagbf fbed | fbcdag fgeca abgdcf cdbage
+baefc febgadc fcag dbgec feg gacfbe gfecb afedgb fg edafcb | aegdfb feabc agbfed fabged
+gfedcb eadgcf fed befdagc gaedf bgdea bdafcg fe acdfg feca | bcfdga cagfd afce efca
+cbfed degfba fgdbac acdg fdcab ac acgebf agdfb bac gcbfdea | cbdegfa caefgbd ca gdbcafe
+dbcgea dc dcg cadf abgcdf efgdb afgbc gefacdb fbcdg agebfc | dabgce gbceda dgc dc
+ef dgfbc cefbg gabecfd agceb feg gbcadf dfbe fcdgeb dfagec | gfe cafegd dfeb fe
+ebgdc egdacb dfbcega dfe dbfge bagef ecdbfg bdcf df fgecad | dbgce fd cfdb edf
+bdage ab fbgaecd aefb bfadeg gefad cdgeb agcbdf gba fgcdae | cgdbfa befa dgefca acebfdg
+aecb dbgecf eagfcb ecdbfag fdegba geacf gebfa cge cgdfa ec | acgfe gec cabe fgcda
+acd cafg abedcgf cfebda efcbgd cegfd ca cdgafe agcde bgeda | egcfbda gcfdae gefacd dca
+dcefga gdefa db fbaed abefdgc faebc fbgaed bdf gbed dcafgb | bfd db db gbdfae
+befac abcd bdcfe ecd cd baegfc edfgca adfbce aebcdgf edbfg | cgedfab feabc cd dabc
+eacdgf cebgdfa acgebd ecdba dbcfea fdgcb dag ga acgdb abge | ag ga adg ag
+gca fagbe dfageb bagce ecgfab gfce gc dcfeabg fadbcg bedac | afbdceg gadfeb cga acbdfg
+gbad febac dea gadbecf fdegbc edfacg da bdecg cdbea bdcgae | dbag cdeabg gcdaeb adbg
+cdgfeb cbeaf adef cfa fa aecbg fedcb acdebf bdcfga cdefbga | fdea eadf efad caefb
+aedgb df cgbaed gdef bfcgda bfd efbac dgfeab debfa aegcbdf | acbfe egfd afebgd gefd
+badcfe fcbg bf dfecbga faged gfadbc dfb dfgab abdcg dbceag | bf fb dafbgec fbd
+bdae decgbf afcbge bdecfa afcbd edgfcab ebcaf bd dfacg dbc | ebda db cbd cbd
+acfgde ae eac agbdec gadcb ebgcafd baed gfcbe cgabe bfgadc | cea fecdga ebgdac eac
+cbedga cfb adcbe bfae afcdgeb cgdaf fcedab bf fcbdeg dacbf | dfceba fcdga fbc fcebda
+cdafg dfgeac fc dbgcef gadbc gacfebd dcf edfgab gefad caef | fadgc facged adgefb ecgbdaf
+gdcbf eabdgf gaefd fbdge afcedg bacgfe fagbedc dbea efb be | ecagfb dgaef be eb
+gbecad faced abgedf cd cbfd abedcf dacgbfe cde deabf agcfe | cd edbfac cgabed daebfg
+cgebaf dacbge gafed eadbgf dgcef ad fadgbce dea bgafe dafb | fegad dgeaf ad gdfae
+ecfadb eagdbc afbcdge abfcgd cf bgedf agfc cfd gbfdc bcagd | fcga fcd befgd gdbfc
+afcbg gfeb gfcad ecgdba cbf cafbeg bacge fb ebdfac baedcfg | fbc gabce egabc fcadg
+agd gadbc da agcfed gcebad dgfcb ecabg ebcagdf eadb becfag | fgbeadc bcega geacb gceab
+gaebf gfdbce aefbgd fde aefcbg ed dcaebfg agde aefdb acfdb | efd agcdebf cbgefd ebgfa
+cdgfe ecbafd ebgca ad gedbcfa cad adbg cedabg egcad fcebga | gbedac adgb ecdgab daceg
+efcb fcdag begdfa egcdf edf fe gfcdeb cdbega geacdbf becdg | dagfc gbadef decbg fe
+bgaed agfdc fdgea fae fabcgd gcfe fe decfga afgedcb facbed | gdafe ef eacfbgd fe
+ebgfca def fd ecgfbd efbda eabdg edgcfba afdc ecbfa bfdaec | abcefd fd dafc debcagf
+eacbg efbdgca fdbga gde abecdg beagd cdeafg de cebd ecagbf | gaedbc gdcbafe gaecdf bgdeac
+bafce cedb edacgfb fbgac fbe aedfgb be cbedfa cdefa eacfgd | be acbfg gfbac edbc
+dgba cbgfdea gbe fbaegc cbedga fegdc decafb cdbge bg daecb | cadfbe bgad beadgc bgedc
+abd fdbcae aedfb daec ad bacfdg dgefcb agbef cbefd cbagdef | ad dab acde da
+cdagbe dagbe fageb gdfbeca gdcba edac dgcfba egd egcfbd ed | fbgcad cafdbg de facbged
+dbecf egadfb cfagde da fcebga cagef dae fadec dagc dfbcaeg | da dgac bfedc ad
+efa adcf fgcde acgeb bgedfa efcga degfbc aegcfdb fa efdgac | cfgea fedgc ecagf efdacgb
+fecga eafgd acgefb cf gceab fbcdag gecdafb cabedg fbec gcf | agcbfd gfc cgf ceagf
+egcaf ecdafgb dfgea cbafe dfebgc bgac cbagef cg gfc ecdfab | edbfgca edafg cgf gfc
+afdcgb decgb fbdegca fbgae fdbaeg dgfbe gbafce df fdb efda | gcbed dafe gbfdca aefgb
+gaebd baefg cfadbg fb gaedfbc gadbef cfgea bfde baf gacdeb | abf cdbagf aecbdg fagec
+cfdb dcg geadbf febdg edfabcg dc bgecd eabcg fcgead cgbfde | dgc dc bdfge dcfebga
+dfbcaeg fdgcae gfdab bagc gabcdf fecbgd cadgf gb fbade bdg | bdg gacb bgac ecfbdg
+eg befdg fceabd badfg dbecf egbcfa bedgcf gbacefd egb dceg | beg faecdb gfdbe dbacef
+cdagef edfca dgfa fca fa agedc gfcabe bdfec bdcage fbcaedg | caedbfg ecafgbd fdcega decgfba
+gfc cfeb cafgdb fc aedgbfc cgdfe degfb aedcg fbegcd dfgbea | acdge fedbg agedc ebgdfa
+aegdcb gde dgbfca eg bdecfga fedbgc gcbfd fgecd bfge acefd | ge debcag bgedcf bfeg
+gbd eagbc cbefagd gcde aefdb gcebad cgdafb dg aegbd facbge | cdeg cged ebdaf gbd
+eagbcf cba aebd cdfga cdegbf afcbedg dcbfe ab adfcb acfbde | bcfeag fgdcbe daeb bdae
+gc dabcfg dcfageb acg ecabf bgadef facge gfeda ecdg fagced | gcde efdga agc fgaed
+bcgdea bacfdg aeg cdabg dfeagc befgd aebc dabfgec ae degba | ebfdg egadcf aceb gbdac
+ceadf defagb fg agbed dfgaebc bfaecg eacdbg afgde efg fgbd | gf egbda fabegc badfgec
+begcfd fdecb fbdga ca bace cfadb egfdca cda cfaedb efabdcg | gacefd fdgba fcdebg bcae
+bcga agbefc fageb ca afc debfc dafegc fdgeab abfdgec fecab | gdafceb befac fdecga ac
+fce adcfg cgdefa bgcfda fdae acegf fe cgbae adgfceb cdegfb | gedacbf fdebgac deaf afde
+agcf dbegf bga cfeba gfdebca fgaeb cbdefa ag egadcb cbfega | fbdge gcabef cagf ebdafc
+aedg ge decbga bafce ecg gcdab degfcab gcfdeb ceabg abdcfg | cbfea ecg bafec eacfb
+gfdceb cgb bcdfe gebdc egcabdf egcf bafcgd bgdae edabfc cg | gbc bgdfca cgfe gc
+bg bedcf dgfaec fdbgc gcbafed fbg bfaged gadcf cgab acbgfd | agfbde bg bgcdf fgb
+gafcb cdfgab abfcge cbgde bdcfae ea faeg dbgcafe ace agebc | decbaf fbacde bcagf ace
+bgfdac cgabdef efdca fagce febagc cd fcd dfeacg gdce aefdb | dc dgcfba ecdagf gfacbe
+bde eb egfbdc ebgfd fbdgc daebgc cagfbd gfbceda efbc aedfg | cgebadf becf cfbdg cfbedg
+ebcdfag fadec daceg gbecaf eabcfd fd fad aebfc fcgbad efbd | dcefbag fceagb fdecabg adf
+efgd fd bfagcd acefb febad gdbaef edcgba badge dbgaefc daf | eafbd gbcdfa gdfe edgba
+cefdag bfagec bedcg da acd bcfead bdgcefa gcaef acdeg agfd | geacbf faegdc fcdgbea eacgfdb
+bcedgaf bgfae cab bdcg cb gcade egdacf abdegc agbec becfad | gfcadbe adgbec gebfcda cfaedg
+gf edbcafg cfge gdafe gdf cdabfg eabdg dgefac acfed fbceda | geabd cbgdfa ceadbf agbfdc
+fcbgde fbged cgfdb gdebcaf cfge ebg deabf baedcg ge dfabcg | beadf ge dcbgef cfeg
+eafdcb gcdfbea eag dgcba gacdef agebd dbefag deabf ge fgbe | fcbdea bgcdeaf dbgac fagcebd
+dc fgebad ecd aedcfb cdga ebcagd dfbaecg adebg debcg gbecf | bcegd gcdeb dacg eagdb
+cad feabgd fadegc bgcdfea gbcfa bgcda bgaced decb dc ebadg | acd adfbge cd dc
+af cfbge fadecg afbgc dbaf gbdfac bdgeacf dbcga cfa gebcda | fa dabcg dafb gbceda
+fbgdea gcefa agfdb fecdba egbd fdgea de bagfcd gdcbafe dae | ed eda abdefc fadgeb
+fdbcga fdbae bfa adfcge gcbfaed bfeg fdage eacbd fgbaed fb | bdcfage fbeg eadfbg gbef
+cfdbga fdeab gefbad bcaefd egad fdaegbc ag gcefb afg agefb | abfgecd egda bgcfe adefb
+fbeda ae dae bdgfe gcadbf beac fedabc badfc ceagfd dgcbafe | bfcad gfabdc aed fbdac
+fgcaed bagcef bdfc edabg efacd ebcadf fb afb abefd agfbdce | cfdb fb abf abf
+fed bfaedc fceab edabg bfdea ecdagf begfdac df fceabg bfcd | cebgfa df eagbd gafced
+egfdc fcg cadg dfebc dfebcga cg dgabef ebgacf dfgea gcfade | fbedc gcfed dcag fgc
+fcbde fbeacgd afedb da fcegda dabg ebgaf dgfaeb dea febagc | da bfdce egfacb ad
+fcdeg cdbe fgcab dceagf febcg eb cebdgf geb edfgab dbgcaef | abgcfed bdec gdcfe cfgdbe
+degfb ebdacf edbfcg agdfce dbf bd bgcd dgfce gfdcbae abegf | gebfcd fgeab gecdfb gdafcbe
+egacd abedg decfgba dagceb ca cabe cag dagfcb badfeg cegfd | gca caeb cfgde ca
+gfa ebafd fg gafdbec gaecfb gbdfa edfg gaedbf bdgca ecadfb | fbagec fecabd caegbf fg
+dfgce cgfbe cefad bfdace fcaged cdg badceg fdceagb dg afdg | gcfbe dg gadf edfabc
+dfgbc cbfeda bdgcfe fdb efbg bf gcedb fdaecgb gdecba fgadc | bgdafec bgcde fbgdc agdfc
+fgecd dbegfac adbfgc fa bdcage acegb eacgf efab fca fceabg | gafce af gdcbea af
+fgdacb fbdec adb gfda acbdegf edbcga cfgba da cbgefa cadfb | gbcfea bgcfda da dab
+fbcdg abfcdg cfegbda ed dbcaef gedcfb aecgb dcegb ced egdf | cabfgde egcdfb fbcade dgcfab
+dbec fcd cegbdf dc fdacgeb abdfg baefcg gbfcd dafgce gfbec | dcf cfd fcd agefcb
+fcdeg gdefb cfgadbe fb bef bfcg edfacb fecdgb gcdfea gadeb | efb feb fbcg dabge
+acebd dacfg bdf agdcbfe gcafdb fcegad afgdbe bcfg bfcad bf | dbf bdaec bf febacdg
+acdegf bdfa afdebg febcga gaefb fd fed dgefcab bedgf edbcg | efgdab aecdgf cedgbfa def
+ecdfabg dfge cedfba fcadgb fgabd ebgfad fea egafb bcgae ef | efgdbca eagcfdb defg bfgda
+efacgd bfda bcadg gab gbceadf ab cfbdga gadfc bcgfae dgbec | fgecad dbaf ba abfgdec
+bcgaed fbgc edcfg dgbecf fgdae dgc cg abdcef gfcbdea ebfdc | cg cdfeb cg edbcfag
+cagb fgcdeab gdebaf fcegd ecabfd acfeg ag afceb fga acgbfe | ga agf bcadfe fag
+fbgde efbagc ecgd efdgabc ebdcf fdcgbe abfdg fcbead egb eg | dcge cedbgf fbgad acegfbd
+febadcg cfdbge bgcef gecd ed gbdaf bfdeg deb gfabce fcbead | efdbca ed fgcbe cebdaf
+eagbc cgde cafbg abdge fbdgae gacedb aec ec acefbgd abcefd | bgacf cgbfeda agbed dgec
+efgbdca gfdb cadbfg dag dg degfac bcdaef gdacb bfcad agebc | gda dfagecb gcfdea dag
+gefab bfde acbfgde gfdac ebfgad bfgeca aegbcd eda gfade de | gafbce gcfeabd aefgd fgbcae
+gaecfb cdebgf fec ebcafgd bgecad cf debgc bfead ebfdc cgdf | cdbfe gfcd egbdca edfcgb
+cfdeba bfgd gcedfa gbdae dgefcab cbega dg febadg agd bdaef | dfgb adg gecdfa fcebda
+dea bgdeaf da befdc gdcfaeb ecdbga abecd gacd bgafce eagcb | aedcb facebg abfecdg bagefdc
+gcebf dfbae dbgcfe egdc dgebcaf febcd bcd cagfeb fdgcba dc | bcd efcbd daefb agbdfce
+fa acged bdfec afeg gcfadb bfdagce ecgafd caf acdfe dgaecb | debfc af afge adegc
+bacfdg fadbe egbdfc ba bage acefd baf bgdafe fgebd gdacbef | dbfage bgedf aedgbf acedf
+acgb dgcbfa dba edgbfac acdefb begdf bdgfa dceafg dcagf ba | abd dfbge abd gacb
+gcdea gc agfdce egdfa egcf fbeagd aecbd dgc fcebgad cagfbd | acebd egcf defag gfadceb
+fab begadc ebcad dfbea gfcdab acdfgbe fa fedgb adcfbe feca | cbgead bfcdega fba gbadce
+gb efcagd fgcad cfbg bedca abg fcgbda dgbcafe acbgd bdafeg | abcdgf bcgf cgfb bg
+fbcagd fcdae beacgf gf agf baecdg fecag bgfe cagdbef gbcea | edbagfc ebfg gebf bgcae
+cdgfea bdeacf aefcgb dbca beafc bcgdefa ebdgf ad defab ade | dbcgefa da ade bacd
+bcgaedf badecg cfegb afceg dcbf egdbfa gcedb gbf bf fgcdbe | bagfed bdagfe fdbc gefcbd
+cegba bgeda cgefa cbde fegadb dagcbe acfgdb cb cbg ecbdafg | cdegabf ebgda bfgade ebgac
+afbdg gdabec gcafdeb fc cfdeba bcf fgebdc cefg gcdbf ecdbg | fecg cdbefg gdbfc gfce
+bgdfa egbf bcdgfa fe dfcbea aef feadgb edcag dagef afdcegb | fea cbedfa acdfgeb dfgeab
+eacgfd caegdb gbfecad bdfce edcfa dgaf fea fa egdac aegbcf | af fa edbcf gdeacbf
+baefg fedabcg gbfac gacbfe cb dfageb dcfag cgb bcea cfdegb | cabe eabc gfacd fgdcabe
+fgdeac cgd ebdfga agefdbc bfcegd cdgbf cd cfabg dceb befgd | cgd cfgab fdgeb efbgd
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