Solve #1

2025/go.mod

@@ -0,0 +1,3 @@
+module forgejo.gwairfelin.com/aoc
+
+go 1.25.4

2025/one.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"strconv"
+)
+
+func mod(a int, b int) int {
+	return (a%b + b) % b
+}
+
+func One() {
+	cur := 50
+	n_zeroes := 0
+
+	file, err := os.Open("one.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	for scanner.Scan() {
+		text := scanner.Text()
+
+		num, err := strconv.Atoi(text[1:])
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		var next_pre_modulo int = 0
+		if text[0] == 'R' {
+			next_pre_modulo = cur + num
+			n_zeroes += next_pre_modulo / 100
+		} else {
+			next_pre_modulo = cur - num
+			if next_pre_modulo <= 0 {
+				extra := (next_pre_modulo / -100)
+
+				// Omg you sneaky fuck!  We only add one if we didn't start on
+				// 0 already.
+				if cur != 0 {
+					extra += 1
+				}
+
+				n_zeroes += extra
+			}
+		}
+
+		cur = mod(next_pre_modulo, 100)
+		log.Printf("Next pre mod: %d, post mod: %d, n zeroes: %d", next_pre_modulo, cur, n_zeroes)
+	}
+
+}
+
+func main() {
+	One()
+}