Advent 2016 Day 1 Part 1 & 2

advent_of_code_2016/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "advent_of_code_2025"
+version = "0.1.0"
+dependencies = [
+ "paste",
+]
+
+[[package]]
+name = "paste"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"

advent_of_code_2016/Cargo.toml

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+[package]
+name = "advent_of_code_2025"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+paste = "1.0"

advent_of_code_2016/rustfmt.toml

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+binop_separator = "Back"
+brace_style = "PreferSameLine"
+edition = "2024"
+enum_discrim_align_threshold = 120
+fn_single_line = false
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"
+indent_style = "Block"
+max_width = 160
+reorder_impl_items = false
+struct_field_align_threshold = 120
+unstable_features = true
+use_small_heuristics = "Max"
+where_single_line = true

advent_of_code_2016/src/day1/input.txt

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+R5, L2, L1, R1, R3, R3, L3, R3, R4, L2, R4, L4, R4, R3, L2, L1, L1, R2, R4, R4, L4, R3, L2, R1, L4, R1, R3, L5, L4, L5, R3, L3, L1, L1, R4, R2, R2, L1, L4, R191, R5, L2, R46, R3, L1, R74, L2, R2, R187, R3, R4, R1, L4, L4, L2, R4, L5, R4, R3, L2, L1, R3, R3, R3, R1, R1, L4, R4, R1, R5, R2, R1, R3, L4, L2, L2, R1, L3, R1, R3, L5, L3, R5, R3, R4, L1, R3, R2, R1, R2, L4, L1, L1, R3, L3, R4, L2, L4, L5, L5, L4, R2, R5, L4, R4, L2, R3, L4, L3, L5, R5, L4, L2, R3, R5, R5, L1, L4, R3, L1, R2, L5, L1, R4, L1, R5, R1, L4, L4, L4, R4, R3, L5, R1, L3, R4, R3, L2, L1, R1, R2, R2, R2, L1, L1, L2, L5, L3, L1

advent_of_code_2016/src/day1/mod.rs

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+pub mod part1;
+pub mod part2;

advent_of_code_2016/src/day1/part1.rs

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+pub fn solve(input: &str) {
+    let instructions = input.split(", ").map(|instr| (&instr[..1], instr[1..].parse::<i32>().unwrap())).collect::<Vec<_>>();
+
+    let mut direction = 0;
+    let directions = [(0, 1), (1, 0), (0, -1), (-1, 0)]; // N E S W
+    let mut position = (0, 0);
+
+    for (rotation, distance) in instructions {
+        if rotation == "R" {
+            direction = (direction + 1) % 4;
+        } else {
+            direction = (direction + 3) % 4;
+        }
+
+        position = (position.0 + distance * directions[direction as usize].0, position.1 + distance * directions[direction as usize].1)
+    }
+
+    println!("position: {position:?}");
+    println!("distance: {}", position.0.abs() + position.1.abs());
+}

advent_of_code_2016/src/day1/part2.rs

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+use std::collections::HashSet;
+
+pub fn solve(input: &str) {
+    let instructions = input.split(", ").map(|instr| (&instr[..1], instr[1..].parse::<i32>().unwrap())).collect::<Vec<_>>();
+
+    let mut direction = 0;
+    let directions = [(0, 1), (1, 0), (0, -1), (-1, 0)]; // N E S W
+    let mut position: (i32, i32) = (0, 0);
+
+    let mut visited = HashSet::new();
+    visited.insert((0, 0));
+
+    'outer: for (rotation, distance) in instructions {
+        if rotation == "R" {
+            direction = (direction + 1) % 4;
+        } else {
+            direction = (direction + 3) % 4;
+        }
+
+        for _ in 0..distance {
+            position = (position.0 + directions[direction].0, position.1 + directions[direction].1);
+            
+            if visited.contains(&position) {
+                break 'outer;
+            }
+            visited.insert(position);
+        }
+    }
+
+    println!("position: {position:?}");
+    println!("distance: {}", position.0.abs() + position.1.abs());
+}

advent_of_code_2016/src/day1/test.txt

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+R8, R4, R4, R8

advent_of_code_2016/src/main.rs

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+use paste::paste;
+mod utility;
+
+solve_day!{1}
+// test_day!{1}

advent_of_code_2016/src/utility/inputstring.rs

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+use std::fs::read_to_string;
+
+pub fn get_input_string(day: u8) -> String {
+    read_to_string(format!("src/day{}/input.txt", day)).expect("Failed to read input file.")
+}
+
+pub fn get_test_string(day: u8, file: Option<&str>) -> String {
+    let filename = file.unwrap_or("test.txt");
+    read_to_string(format!("src/day{}/{}", day, filename)).expect("Failed to read input file.")
+}

advent_of_code_2016/src/utility/mod.rs

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+#![allow(unused)]
+
+mod inputstring;
+pub use inputstring::{get_input_string, get_test_string};
+
+mod solveday;

advent_of_code_2016/src/utility/solveday.rs

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+#[macro_export]
+macro_rules! solve_day {
+    ($day:literal) => {
+        paste! {mod  [<day $day>];}
+
+        pub fn main() {
+            println!("-- Day {} --", $day);
+            let input = utility::get_input_string($day);
+            paste! { [<day $day>] ::part1::solve(&input) };
+            paste! { [<day $day>] ::part2::solve(&input) };
+        }
+    };
+    ($day:literal, $filename:literal) => {
+        paste! {mod  [<day $day>];}
+
+        pub fn main() {
+            println!("-- Day {} --", $day);
+            let input = utility::get_test_string($day, Some($filename));
+            paste! { [<day $day>] ::part1::solve(&input) };
+            println!("\n---\n");
+            paste! { [<day $day>] ::part2::solve(&input) };
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! test_day {
+    ($day:literal) => {
+        solve_day!($day, "test.txt");
+    };
+}