From abbc9560bd6fd0bff70e8e7a8b413faa6d7f1646 Mon Sep 17 00:00:00 2001
From: alex <>
Date: Mon, 1 Dec 2025 13:21:27 +0100
Subject: [PATCH] day01 + folder setup

---
 .gitignore      |    3 +
 Cargo.lock      |    7 +
 Cargo.toml      |    6 +
 input/day01.txt | 4493 +++++++++++++++++++++++++++++++++++++++++++++++
 src/day01.rs    |   90 +
 src/main.rs     |   27 +
 6 files changed, 4626 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 input/day01.txt
 create mode 100644 src/day01.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e337bb6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+.cookie
+html/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..27cb306
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aoc_2025"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2aba261
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "aoc_2025"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/input/day01.txt b/input/day01.txt
new file mode 100644
index 0000000..a3b31f6
--- /dev/null
+++ b/input/day01.txt
@@ -0,0 +1,4493 @@
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diff --git a/src/day01.rs b/src/day01.rs
new file mode 100644
index 0000000..f84557a
--- /dev/null
+++ b/src/day01.rs
@@ -0,0 +1,90 @@
+use std::error::Error;
+
+pub fn run(input: &str) -> Result<(), Box<dyn Error>> {
+    println!("part 1: {}", part1(input)?);
+    println!("part 2: {}", part2(input)?);
+    Ok(())
+}
+
+fn part1(input: &str) -> Result<i32, Box<dyn Error>> {
+    let mut res = 0;
+    let mut pos = 50;
+    for l in input.lines() {
+        let (dir, step) = l.split_at(1);
+        let mut step = step.parse::<i32>()?;
+        if dir == "L" {
+            step *= -1;
+        }
+        pos = (pos + step) % 100;
+        if pos < 0 {
+            pos += 100;
+        }
+        if pos == 0 {
+            res += 1;
+        }
+    }
+
+    Ok(res)
+}
+
+fn part2(input: &str) -> Result<i32, Box<dyn Error>> {
+    let mut click = 0;
+    let mut pos = 50;
+    let mut pos_last = 50;
+    for l in input.lines() {
+        let (dir, step) = l.split_at(1);
+        let mut step = step.parse::<i32>()?;
+        if dir == "L" {
+            step *= -1;
+        }
+        click += step.abs() / 100; // number of turns
+        step = step % 100;
+        if step == 0 {
+            continue;
+        }
+        pos += step;
+        if pos == 0 {
+            click += if pos_last == 0 { 0 } else { 1 };
+        }
+        else if pos < 0 {
+            click += if pos_last == 0 { 0 } else { 1 };
+            pos += 100;
+        }
+        else if pos >= 100 {
+            click += if pos_last == 0 { 0 } else { 1 };
+            pos -= 100;
+        }
+        pos_last = pos;
+    }
+
+    Ok(click)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    static TEXT_INPUT: &str = "\
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82";
+
+    #[test]
+    fn test_part1() {
+        assert_eq!(3, part1(TEXT_INPUT).unwrap());
+    }
+    #[test]
+    fn test_part2() {
+        assert_eq!(6, part2(TEXT_INPUT).unwrap());
+    }
+    #[test]
+    fn test_part2_r1000() {
+        assert_eq!(10, part2("R1000").unwrap());
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d64487e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,27 @@
+use std::env;
+use std::process;
+use std::error::Error;
+use std::fs::File;
+use std::io::Read;
+
+pub mod day01;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    if let Err(e) = run(&args[1], &args[2]) {
+        println!("Error: {e}");
+        process::exit(2);
+    }
+}
+
+fn run(day: &str, input_file: &str) -> Result<(), Box<dyn Error>> {
+    let mut f = File::open(input_file)?;
+    let mut input = String::new();
+    f.read_to_string(&mut input)?;
+
+    match day {
+        "day01" => day01::run(&input)?,
+        _ => return Err(format!("unknown or unimplemented day \"{day}\"").into()),
+    }
+    Ok(())
+}
-- 
2.39.5