feat: solve p1

internal/2025/DayTwo/code.go

@@ -0,0 +1,47 @@
+package daytwo
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func init() {
+	registry.Register("2025D2", ParseInput, PartOne, PartTwo)
+}
+
+func isInvalidID(id int) bool {
+	sID := strconv.Itoa(id)
+	if len(sID)%2 != 0 {
+		return false
+	}
+	half := len(sID) / 2
+	return sID[:half] == sID[half:]
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	return strings.Split(strings.TrimSpace(string(content)), "\n")
+}
+
+func PartOne(input []string) int {
+	sum := 0
+	for _, line := range input {
+		for newRange := range strings.SplitSeq(line, ",") {
+			parts := strings.Split(newRange, "-")
+			start, _ := strconv.Atoi(parts[0])
+			end, _ := strconv.Atoi(parts[1])
+			for id := start; id <= end; id++ {
+				if isInvalidID(id) {
+					sum += id
+				}
+			}
+		}
+	}
+	return sum
+}
+
+func PartTwo(input []string) int {
+	return 0
+}