day 01

01/go.mod

@@ -0,0 +1,3 @@
+module git.z1glr.de/advent-of-code-2025/01
+
+go 1.25.4

01/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	if bytes, err := os.ReadFile("input"); err != nil {
+		panic(err)
+	} else {
+		content := strings.TrimSpace(string(bytes))
+
+		turns := strings.SplitSeq(content, "\n")
+
+		position := 50
+		zeroCount := 0
+
+		zeroPasses := 0
+
+		for turn := range turns {
+			left := turn[0] == 'L'
+
+			if steps, err := strconv.Atoi(strings.TrimSpace(turn[1:])); err != nil {
+				panic(err)
+			} else {
+				for range steps {
+					if left {
+						position--
+					} else {
+						position++
+					}
+
+					position = (position + 100) % 100
+
+					if position == 0 {
+						zeroPasses++
+					}
+				}
+
+				if position == 0 {
+					zeroCount++
+				}
+
+				fmt.Println()
+			}
+		}
+
+		fmt.Println(zeroCount)
+		fmt.Println(zeroPasses)
+	}
+}

01/test

@@ -0,0 +1,10 @@
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82

01/wrongs

@@ -0,0 +1,2 @@
+6586
+6350