Day 6.

day6/part1/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+type Group struct {
+	QuestionsAnsweredWithYes []rune
+	Persons                  []string
+}
+
+func FromLines(lines []string) *Group {
+	g := &Group{
+		QuestionsAnsweredWithYes: []rune{},
+		Persons:                  []string{},
+	}
+	for _, line := range lines {
+		g.Persons = append(g.Persons, line)
+	thisPersonsAnswer:
+		for _, answer := range line {
+			for _, alreadyAnswered := range g.QuestionsAnsweredWithYes {
+				if alreadyAnswered == answer {
+					continue thisPersonsAnswer
+				}
+			}
+			g.QuestionsAnsweredWithYes = append(g.QuestionsAnsweredWithYes, answer)
+		}
+	}
+	return g
+}
+
+func main() {
+	groups := []*Group{}
+
+	f, err := os.Open("input")
+	if err != nil {
+		panic(err)
+	}
+	r := bufio.NewReader(f)
+	currentGroup := []string{}
+	for {
+		line, err := r.ReadString('\n')
+		line = strings.TrimSpace(line)
+		if err == io.EOF || len(line) <= 0 {
+			if len(currentGroup) > 0 {
+				groups = append(groups, FromLines(currentGroup))
+				currentGroup = []string{}
+			}
+			if err == io.EOF {
+				break
+			}
+			continue
+		}
+		if err != nil {
+			panic(err)
+		}
+		currentGroup = append(currentGroup, line)
+	}
+
+	sum := 0
+	for _, group := range groups {
+		sum += len(group.QuestionsAnsweredWithYes)
+	}
+
+	log.Printf("Sum: %d", sum)
+}

day6/part2/main.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+type Group struct {
+	QuestionsAnsweredWithYes []rune
+	Persons                  []string
+}
+
+func (g *Group) SumOfAgreedQuestions() int {
+	sum := 0
+	for _, answer := range g.QuestionsAnsweredWithYes {
+		allAnsweredWithYes := true
+		for _, person := range g.Persons {
+			personHasAnsweredWithYes := false
+			for _, personAnswer := range person {
+				if personAnswer == answer {
+					personHasAnsweredWithYes = true
+					break
+				}
+			}
+			if !personHasAnsweredWithYes {
+				allAnsweredWithYes = false
+				break
+			}
+		}
+		if allAnsweredWithYes {
+			sum++
+		}
+	}
+	return sum
+}
+
+func FromLines(lines []string) *Group {
+	g := &Group{
+		QuestionsAnsweredWithYes: []rune{},
+		Persons:                  []string{},
+	}
+	for _, line := range lines {
+		g.Persons = append(g.Persons, line)
+	thisPersonsAnswer:
+		for _, answer := range line {
+			for _, alreadyAnswered := range g.QuestionsAnsweredWithYes {
+				if alreadyAnswered == answer {
+					continue thisPersonsAnswer
+				}
+			}
+			g.QuestionsAnsweredWithYes = append(g.QuestionsAnsweredWithYes, answer)
+		}
+	}
+	return g
+}
+
+func main() {
+	groups := []*Group{}
+
+	f, err := os.Open("input")
+	if err != nil {
+		panic(err)
+	}
+	r := bufio.NewReader(f)
+	currentGroup := []string{}
+	for {
+		line, err := r.ReadString('\n')
+		line = strings.TrimSpace(line)
+		if err == io.EOF || len(line) <= 0 {
+			if len(currentGroup) > 0 {
+				groups = append(groups, FromLines(currentGroup))
+				currentGroup = []string{}
+			}
+			if err == io.EOF {
+				break
+			}
+			continue
+		}
+		if err != nil {
+			panic(err)
+		}
+		currentGroup = append(currentGroup, line)
+	}
+
+	sum := 0
+	for _, group := range groups {
+		sum += group.SumOfAgreedQuestions()
+	}
+
+	log.Printf("Sum: %d", sum)
+}