08: part1+2

8/input

@@ -0,0 +1,200 @@
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+gcdefa egbac defbcga da cegdba fdebg bcda fcgaeb eda dageb | gbaced begdf dae da
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+fagcd aecdbf ebcadg edcbf gdbfc bg bgc dfcgeb bfeg afecbgd | dgcabe cfaedb gbc fdgbc
+geafdb gacfed eadbg gce eagbdc begca ce bced cagfb gdaecfb | fcedag gecbad gcbfa ec
+begcfa gaebfd fd cdgeb gafce afcd agfdce fdgec dgf gfacdbe | efgabd adfc efacg eacfgd
+gefca de adefg eacd gbdfec ecfbag geabfcd efd dfegca bgadf | afcgbed agefcd bfdeagc dcea
+ebadc cagedb adcfbeg eadfcb fcdbg cfea faebdg fe decbf fed | gcbfd cabedfg bcadef bedcf
+ce cbfdg cbfge gacbef aceg cbgadfe gbefa feagbd cef dbfcae | egcbf dafegb ec cef
+eagfd gc fgdace gcea dfacgb dgeafb fgc dbfce gdfbeac degfc | cagdfe cg aegc gc
+bcade efgbda fgbed edcbagf cfegbd cbegd cgef gdc gc afbcdg | bdace befdg dcg cg
+fdabce gcdebaf dceg bdgfae dag gacbf dg cbaed bcdag begcda | aegbdc gd cabedg gda
+gf gfdbac fgecb gfc gdceab fbagce ecdbf efdgcba aefg eagbc | gbeca cefbg gcabe acedgb
+dbcaf bcedf gdbfa cedafbg edbgfa agfecb afc bcafgd ca cagd | cafbd caf gcfadb ac
+dbeafc dcaegb cd dcb cgdba dabecgf egadb dbagfe gbfca gced | cabgf gced dc dgce
+bgce aebcfg agecdf bface efc febda gaebdcf ec bgcaf bacgfd | abfde ec efc cebg
+gdeafc ce defcgb gbec fce fdbea cbdef fcdbga gbaecfd bdgcf | ce ecfgdb cfe fedcb
+aegb fedag egf dabfeg dbcafeg defba fcbdae ge adgfc fgedcb | efg dcegfb edcafbg ge
+debagf febgcd gfc dcfgba fbegc fc ebfgd cfed bagfedc aecbg | cfg cgf fgc gebac
+gcfdbe bagfecd fcdbe eb fbeg bgadec cadbf gefdc dbe cafgde | deb eb egfbdac dcgaeb
+dgfea bdefa efb eb edcb gcbafe efdcab dacfb bgcfad adcgbef | dbce ebdc dbgfca bafgec
+becfgd eagcdb dceafb bdf cdbfa edbac efgdcba dcagf fb feba | ebfa fabe bcedaf bf
+bdcaf cgfdeb cfeadg cgd gd dega dfabcge fcagd ecfgab fcaeg | gdc dcbfa eafcbdg gdcaf
+cgedba edagf gb gfcdae gcfeabd dbg aedfbg gdebf edfbc abgf | dfabeg dfgea gdb fcabdge
+agbefcd fgadb dfbage efbd gcbda adfge cbfgea fb fab dcfega | bf ebgdacf fedag fegda
+efdbg fbdcge agdfe cabfdg ebf eb dfgcb dagcfeb ebcd cafegb | eb dfbegac bgfde fcdbg
+ecfba egf dgbeaf dbgcfea gf egfcb egabcd cfgd gefcdb egdcb | gbfec dcfg fg fbgce

8/solve.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+)
+
+func main() {
+	sum1 := 0
+	sum2 := 0
+
+	s := bufio.NewScanner(os.Stdin)
+	for s.Scan() {
+		parts := strings.Split(s.Text(), " | ")
+		samples := strings.Split(parts[0], " ")
+		output := strings.Split(parts[1], " ")
+
+		// sort alphabetically
+		for i := range samples {
+			samples[i] = sortStr(samples[i])
+		}
+		for i := range output {
+			output[i] = sortStr(output[i])
+		}
+		// sort by length
+		sort.Slice(samples, func(i, j int) bool { return len(samples[i]) < len(samples[j]) })
+
+		// save known ones
+		numbers := map[string]int{}
+		numbers[samples[0]] = 1
+		numbers[samples[1]] = 7
+		numbers[samples[2]] = 4
+		numbers[samples[9]] = 8
+
+		fourWithoutOne := substr(samples[2], samples[0])
+		var xi string
+
+		// iterate over 5 segment digits
+		for _, digit := range samples[3:6] {
+			// only 3 has both right segments of 1
+			if hasSegments(digit, samples[0]) {
+				numbers[digit] = 3
+				xi = substr(digit, samples[0])
+			// only 5 has the middle and top-left segments of 4
+			} else if hasSegments(digit, fourWithoutOne) {
+				numbers[digit] = 5
+			} else {
+				numbers[digit] = 2
+			}
+		}
+
+		// iterate over 6 segment digits
+		for _, digit := range samples[6:9] {
+			// only 0 doesn't have all middle segments
+			if !hasSegments(digit, xi) {
+				numbers[digit] = 0
+			// between 6 and 9, only 9 has both right segments of 1
+			} else if hasSegments(digit, samples[0]) {
+				numbers[digit] = 9
+			} else {
+				numbers[digit] = 6
+			}
+		}
+
+		for _, digit := range output {
+			if len(digit) == 2 || len(digit) == 3 || len(digit) == 4 || len(digit) == 7 {
+				sum1++
+			}
+		}
+
+		sum2 += 1000 * numbers[output[0]] + 100 * numbers[output[1]] + 10 * numbers[output[2]] + numbers[output[3]]
+	}
+
+	fmt.Println(sum1)
+	fmt.Println(sum2)
+}
+
+func hasSegments(s string, segments string) bool {
+	res := true
+
+	for _, segment := range segments {
+		if !strings.ContainsRune(s, segment) {
+			res = false
+		}
+	}
+
+	return res
+}
+
+// subtract string
+func substr(a, b string) string {
+	for _, char := range b {
+		a = strings.ReplaceAll(a, string(char), "")
+	}
+	return a
+}
+
+func sortStr(s string) string {
+	r := []rune(s)
+	sort.Slice(r, func(i, j int) bool { return r[i] < r[j] })
+	return string(r)
+}

8/testinput

@@ -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