day09/Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "day09"
-version = "0.1.0"

day09/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "day09"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]

day09/src/main.rs

@@ -1,91 +0,0 @@
-use std::collections::HashSet;
-use std::error;
-use std::fs::File;
-use std::io::BufRead;
-use std::io::BufReader;
-
-
-const DEBUG: bool = false;
-
-
-struct Pos {
-	x: i32,
-	y: i32
-}
-
-impl Pos {
-	// Move the position x into x direction and y into y direction
-	fn move_(&mut self, x: i32, y: i32) {
-		self.x += x;
-		self.y += y;
-	}
-
-	fn move_into_direction(&mut self, direction: &str) -> Result<(), Box<dyn error::Error>> {
-		match direction {
-			"R" => self.move_(1, 0),
-			"L" => self.move_(-1, 0),
-			"U" => self.move_(0, 1),
-			"D" => self.move_(0, -1),
-			_ => Err(format!("Unknown direction {direction}."))?
-		};
-		Ok(())
-	}
-
-	fn move_after(&mut self, other: &Pos) {
-		let x_diff = other.x - self.x;
-		let y_diff = other.y - self.y;
-
-		// no movement if we're close enough
-		if x_diff.abs() <= 1 && y_diff.abs() <= 1 {
-			return
-		}
-
-		if x_diff.abs() == y_diff.abs() {
-			self.move_((x_diff.abs() - 1) * x_diff.signum(), (y_diff.abs() - 1) * y_diff.signum());
-		} else if x_diff.abs() > y_diff.abs() {
-			self.move_((x_diff.abs() - 1) * x_diff.signum(), y_diff);
-		} else {
-			self.move_(x_diff, (y_diff.abs() - 1) * y_diff.signum());
-		}
-	}
-
-	fn show(&self) {
-		println!("x: {} y: {}", self.x, self.y)
-	}
-}
-
-fn main() -> Result<(), Box<dyn error::Error>> {
-	let f = File::open("input.txt")?;
-	let reader = BufReader::new(f);
-
-	let mut knot_positions = vec![];
-	for _ in 0..10 {
-		knot_positions.push(Pos { x: 0, y: 0 });
-	}
-
-	let mut visited_locations = HashSet::new();
-	for line in reader.lines() {
-		let line = line?;
-		let mut s_iter = line.split_whitespace();
-		let direction = s_iter.next().ok_or(format!("Could not split {line} on whitespace"))?;
-		let amount: i32 = s_iter.next().ok_or(format!("Could not split {line} into 2 parts."))?.parse()?;
-		for _ in 0..amount {
-			knot_positions[0].move_into_direction(direction)?;
-			for i in 1..knot_positions.len() {
-				let (head, tail) = knot_positions.split_at_mut(i);
-				tail[0].move_after(head.last().ok_or("head doesn't have an element")?);
-			}
-			if DEBUG {
-				knot_positions[0].show();
-				knot_positions[9].show();
-			}
-			visited_locations.insert((knot_positions[9].x.to_owned(), knot_positions[9].y.to_owned()));
-		}
-		if DEBUG {
-			println!("");
-		}
-	}
-
-    println!("Visited {} locations", visited_locations.len());
-    Ok(())
-}