From b49cb6a1ab7d1d7f38398e65fb7c53d03fcad7f0 Mon Sep 17 00:00:00 2001
From: George Wensor <george.wensor@gmail.com>
Date: Thu, 9 Dec 2021 23:49:36 +0000
Subject: [PATCH] days 8-9

---
 08/input.txt | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++
 08/main.js   |  63 ++++++++++++++++
 09/input.txt | 100 ++++++++++++++++++++++++++
 09/main.js   |  63 ++++++++++++++++
 4 files changed, 426 insertions(+)
 create mode 100644 08/input.txt
 create mode 100644 08/main.js
 create mode 100644 09/input.txt
 create mode 100644 09/main.js

diff --git a/08/input.txt b/08/input.txt
new file mode 100644
index 0000000..da96389
--- /dev/null
+++ b/08/input.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
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+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
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+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
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+gdaec dfgb dcgbefa bde ebadg cbfage cabfed efagb db bdgafe | bd abegf dbe deb
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+begaf dcfegb dbcge gadcbef fc cdabfe fgdc decbga cfb becgf | bfc fc cdebg cgfd
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+fdebgc egba dcaebfg abfgcd ba bda gdceb cefda degcba edcba | dba bdafegc decba bad
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+ec cdagb cegdab dagbcf cbaed ebgc ecd abedf fadcge cebdafg | ecd gacfdb becg ec
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+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
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+cgd bcdafe dacbegf adecb dbfeg bacg gedbc gc fcegad agbdce | cdg fbdge ecdgb eadgfbc
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+ceagfd eadfb fdeag dcgfe gea ag dagcbe fcegbd fbdaceg fcga | gfca fcga dcgefb gfcaebd
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+ad bgdfae eagfd fedcg dagb gdeabcf dea bgcefa abgef fdbaec | afbge eacfbdg bgecfa fabge
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+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
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+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
diff --git a/08/main.js b/08/main.js
new file mode 100644
index 0000000..ef10281
--- /dev/null
+++ b/08/main.js
@@ -0,0 +1,63 @@
+const fs = require("fs")
+
+const input = fs.readFileSync("input.txt", "utf-8", err => {
+    err && console.error(err)
+}).split("\n").filter(str => str.length).map(str => str.split("|"))
+
+const isUniqueSegment = digit => {
+    switch(digit.length){
+        case 2:
+            return 1
+        case 3:
+            return 7
+        case 4:
+            return 4
+        case 7:
+            return 8
+    }
+    return -1
+}
+
+const outputs = input.map(thing => 
+    thing[1].match(/[a-z]+/g)
+)
+
+const inputs = input.map(thing => 
+    thing[0].match(/[a-z]+/g)
+)
+
+let uniqueCount = 0, sum = 0
+for (let i = 0; i < inputs.length; i++){
+    let str = ""
+    const outputSet = outputs[i]
+    const inputSet = inputs[i]
+    const oneSet = inputSet.filter(num => num.length === 2)[0]
+    const fourSet = inputSet.filter(num => num.length === 4)[0]
+    outputSet.forEach(input => {
+        if (isUniqueSegment(input) != -1){
+            str += isUniqueSegment(input)
+            uniqueCount++
+            return
+        }
+        // chars in common with one or four string
+        const fourCount = Array.from(input).filter(c => Array.from(fourSet).indexOf(c) != -1)
+        const oneCount = Array.from(input).filter(c => Array.from(oneSet).indexOf(c) != -1)
+        if (input.length === 5){
+            if (fourCount.length === 2){
+                str += "2"
+            } else {
+                str += oneCount.length === 2 ? "3" : "5"
+            }
+        }
+        if (input.length === 6) {
+            if (fourCount.length === 4){
+                str += "9"
+            } else {
+                str += oneCount.length === 2 ? "0" : "6"
+            }
+        }
+    })
+    sum += parseInt(str)
+}
+
+console.log(uniqueCount, sum)
\ No newline at end of file
diff --git a/09/input.txt b/09/input.txt
new file mode 100644
index 0000000..2e01b71
--- /dev/null
+++ b/09/input.txt
@@ -0,0 +1,100 @@
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diff --git a/09/main.js b/09/main.js
new file mode 100644
index 0000000..443300b
--- /dev/null
+++ b/09/main.js
@@ -0,0 +1,63 @@
+const fs = require("fs")
+
+const input = fs.readFileSync("input.txt", "utf-8", err => {
+    err && console.error(err)
+}).split("\n").filter(str => str.length).map(str => str.split("").map(num => parseInt(num)))
+
+const getNeighbours = (rowNum, colNum) => {
+    return [
+        input[rowNum][colNum - 1] < 9 && [rowNum, colNum - 1],
+        input[rowNum][colNum + 1] < 9 && [rowNum, colNum + 1],
+        input[rowNum - 1] && input[rowNum - 1][colNum] < 9 && [rowNum - 1, colNum],
+        input[rowNum + 1] && input[rowNum + 1][colNum] < 9 && [rowNum + 1, colNum],
+    ].filter(point => point)
+}
+
+const equalArr = (a, b) => a.length === b.length && a.every((v, i) => v === b[i])
+
+const basins = []
+let sum = 0
+
+for (const [rowNum, row] of input.entries()){
+    for (const [colNum, height] of row.entries()){
+        let previousColHeight = row[colNum-1]
+        if (typeof(previousColHeight) === "undefined") {
+            previousColHeight = 9
+        }
+        if (height < previousColHeight){
+            const nextColHeight = row[colNum+1]
+            const previousRowHeight = input[rowNum - 1] && input[rowNum - 1][colNum]
+            const nextRowHeight = input[rowNum + 1] && input[rowNum + 1][colNum]
+
+            if (   (typeof(nextColHeight) != "undefined" && nextColHeight < height)
+                || (typeof(previousRowHeight) != "undefined" && previousRowHeight < height)
+                || (typeof(nextRowHeight) != "undefined" && nextRowHeight < height))
+                continue
+
+            basins.push([rowNum, colNum])
+            sum += height
+        }
+    }
+}
+
+const basinSizes = []
+
+for (const basin of basins) {
+    let neighbours = [basin]
+    for (const neighbour of neighbours){
+        const next = getNeighbours(neighbour[0], neighbour[1])
+        const nonDupes = next.filter(n => {
+            for (let d of neighbours){
+                if (equalArr(d, n))
+                    return false
+            }
+            return true
+        })
+        neighbours.push(...nonDupes);
+    }
+    basinSizes.push(neighbours.length)
+}
+
+basinSizes.sort((a, b) => b - a)
+console.log(sum + basins.length)
+console.log(basinSizes[0] * basinSizes[1] * basinSizes[2])
\ No newline at end of file