Rename directories

.gitignore

@@ -0,0 +1,2 @@
+main
+target/

2020/Day6/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+)
+
+func main() {
+
+	data, err := ioutil.ReadFile("input.txt")
+	if err != nil {
+		fmt.Println("File reading error", err)
+		return
+	}
+	lines := strings.Split(string(data), "\n")
+
+	fmt.Println("First result:", first(lines))
+	fmt.Println("Second result:", second(lines))
+
+}
+
+func first(lines []string) interface{} {
+	groups := make([]string, 0)
+
+	current := ""
+
+	for _, line := range lines {
+		if line == "" {
+			groups = append(groups, current)
+			current = ""
+		} else {
+			current += line
+		}
+	}
+
+	groups = append(groups, current)
+
+	sum := 0
+
+	for _, group := range groups {
+		unique := string(unique([]byte(group)))
+		len := len(unique)
+		sum += len
+	}
+
+	return sum
+}
+
+func second(lines []string) interface{} {
+	groups := make([]string, 0)
+
+	current := ""
+
+	for _, line := range lines {
+		if line == "" {
+			groups = append(groups, current)
+			current = ""
+		} else {
+			current += line
+		}
+	}
+
+	groups = append(groups, current)
+
+	sum := 0
+
+	for _, group := range groups {
+		unique := string(unique([]byte(group)))
+		len := len(unique)
+		sum += len
+	}
+
+	return sum
+}
+
+func unique(intSlice []byte) []byte {
+	keys := make(map[byte]bool)
+	list := []byte{}
+	for _, entry := range intSlice {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+	return list
+}