Day6

day6/day6.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"AoC2020/helper"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetFile(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	groups := strings.Split(input, "\n\n")
+	fmt.Println(day6(groups))
+	fmt.Println(day6Part2(groups))
+}
+
+func day6(groups []string) int {
+	var count int
+	for _, group := range groups {
+		count += len(getYesAnsweredQuestions(group))
+	}
+	return count
+}
+
+func day6Part2(groups []string) int {
+	var count int
+	for _, group := range groups {
+		count += getQuestionsEveryoneAnsweredYes(group)
+	}
+	return count
+}
+
+func getYesAnsweredQuestions(group string) string {
+	var answeredQuestions string
+	persons := strings.Split(group, "\n")
+	for _, person := range persons {
+		for _, answer := range person {
+			if !strings.Contains(answeredQuestions, string(answer)) {
+				answeredQuestions += string(answer)
+			}
+		}
+	}
+	return answeredQuestions
+}
+
+func getQuestionsEveryoneAnsweredYes(group string) int {
+	var questions [26]int
+	persons := strings.Split(group, "\n")
+	for _, person := range persons {
+		for _, answer := range person {
+			questions[answer-97] += 1
+		}
+	}
+	count := 0
+	for _,question := range questions {
+		if question == len(persons){
+			count++
+		}
+	}
+	return count
+}

day6/day6Test.txt

@@ -0,0 +1,15 @@
+abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b