Day 6 part 1

main.go

@@ -21,6 +21,9 @@ func main() {
 
 	runAndBenchmark("05", "1", false, solutions.Day05Part01)
 	runAndBenchmark("05", "2", false, solutions.Day05Part02)
+
+	runAndBenchmark("06", "1", false, solutions.Day06Part01)
+	runAndBenchmark("06", "2", false, solutions.Day06Part02)
 }
 
 type execute func(bool) int

solutions/day06.go

@@ -0,0 +1,35 @@
+package solutions
+
+import (
+	"strings"
+)
+
+func Day06Part01(isTest bool) int {
+	input := ReadInput("06", isTest)
+	groups := strings.Split(input, "\n\n")
+
+	sum := 0
+
+	for _, group := range groups {
+		frequency := make(map[rune]int)
+
+		for _, letter := range group {
+			// remove non a-z character
+			if letter < 97 || letter > 122 {
+				continue
+			}
+
+			previousValue, _ := frequency[letter]
+			frequency[letter] = previousValue + 1
+		}
+
+		sum += len(frequency)
+	}
+
+	return sum
+}
+
+func Day06Part02(isTest bool) int {
+
+	return -1
+}