Day 6 part 2

main.go

@@ -18,6 +18,12 @@ func main() {
 
 	runAndBenchmark("04", "1", false, solutions.Day04Part01)
 	runAndBenchmark("04", "2", false, solutions.Day04Part02)
+
+	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/day05.go

@@ -0,0 +1,63 @@
+package solutions
+
+import (
+	"slices"
+	"strconv"
+	"strings"
+)
+
+func seatStrToSeatId(seat string) int {
+	rowStr := seat[:7]
+	rowStr = strings.ReplaceAll(rowStr, "F", "0")
+	rowStr = strings.ReplaceAll(rowStr, "B", "1")
+	columnStr := seat[7:]
+	columnStr = strings.ReplaceAll(columnStr, "L", "0")
+	columnStr = strings.ReplaceAll(columnStr, "R", "1")
+
+	row, _ := strconv.ParseInt(rowStr, 2, 64)
+	column, _ := strconv.ParseInt(columnStr, 2, 64)
+
+	return int(row*8 + column)
+}
+
+func Day05Part01(isTest bool) int {
+	input := ReadInput("05", isTest)
+	seats := strings.Split(input, "\n")
+
+	highestSeatId := 0
+
+	for _, seat := range seats {
+		seatId := seatStrToSeatId(seat)
+		if seatId > highestSeatId {
+			highestSeatId = seatId
+		}
+	}
+
+	return highestSeatId
+}
+
+func Day05Part02(isTest bool) int {
+	input := ReadInput("05", isTest)
+	seats := strings.Split(input, "\n")
+	seatsAmount := len(seats)
+
+	seatIds := make([]int, seatsAmount)
+
+	for i, seat := range seats {
+		seatId := seatStrToSeatId(seat)
+		seatIds[i] = seatId
+	}
+
+	slices.Sort(seatIds)
+
+	for i := 0; i < seatsAmount-1; i++ {
+		el1 := seatIds[i]
+		el2 := seatIds[i+1]
+
+		if el2-el1 == 2 {
+			return el1 + 1
+		}
+	}
+
+	return -1
+}

solutions/day06.go

@@ -0,0 +1,59 @@
+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 {
+	input := ReadInput("06", isTest)
+	groups := strings.Split(input, "\n\n")
+
+	sum := 0
+
+	for _, group := range groups {
+		persons := strings.Split(group, "\n")
+		personAmount := len(persons)
+
+		frequency := make(map[rune]int)
+
+		for _, person := range persons {
+			for _, letter := range person {
+				previousValue, _ := frequency[letter]
+				frequency[letter] = previousValue + 1
+			}
+		}
+
+		for _, value := range frequency {
+			if value == personAmount {
+				sum += 1
+			}
+		}
+	}
+
+	return sum
+}