feat: add 2022D1 solutions

internal/2022/DayOne/code.go

@@ -0,0 +1,62 @@
+package dayone
+
+import (
+	"advent-of-code/internal/registry"
+	"cmp"
+	"os"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+func init() {
+	registry.Register("2022D1", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	return strings.Split(string(content), "\n")
+}
+
+func PartOne(input []string) int {
+	maxCalories, currentElf := 0, 0
+
+	for _, line := range input {
+		if line == "" {
+			maxCalories = max(maxCalories, currentElf)
+			currentElf = 0
+			continue
+		}
+		val, _ := strconv.Atoi(line)
+		currentElf += val
+	}
+
+	return max(maxCalories, currentElf)
+}
+
+func PartTwo(input []string) int {
+	var totals []int
+	currentElf := 0
+
+	for _, line := range input {
+		if line == "" {
+			totals = append(totals, currentElf)
+			currentElf = 0
+			continue
+		}
+
+		val, _ := strconv.Atoi(line)
+		currentElf += val
+	}
+	totals = append(totals, currentElf)
+
+	slices.SortFunc(totals, func(a, b int) int {
+		return cmp.Compare(b, a)
+	})
+
+	sum := 0
+	for idx := 0; idx < 3 && idx < len(totals); idx++ {
+		sum += totals[idx]
+	}
+	return sum
+}