From 4f4e546fa6113fe23e7ca68d4083aa44cd9de6b9 Mon Sep 17 00:00:00 2001
From: Maximilian Friedersdorff <max@gwairfelin.com>
Date: Mon, 1 Dec 2025 21:48:28 +0000
Subject: [PATCH] Solve #1

---
 2025/go.mod |  3 +++
 2025/one.go | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 2025/go.mod
 create mode 100644 2025/one.go

diff --git a/2025/go.mod b/2025/go.mod
new file mode 100644
index 0000000..05b41ba
--- /dev/null
+++ b/2025/go.mod
@@ -0,0 +1,3 @@
+module forgejo.gwairfelin.com/aoc
+
+go 1.25.4
diff --git a/2025/one.go b/2025/one.go
new file mode 100644
index 0000000..d579838
--- /dev/null
+++ b/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()
+}