2019 day 1

Author: ictrobot

Cargo.lock

@@ -14,6 +14,7 @@ year2015 = { path = "../year2015", optional = true }
 year2016 = { path = "../year2016", optional = true }
 year2017 = { path = "../year2017", optional = true }
 year2018 = { path = "../year2018", optional = true }
+year2019 = { path = "../year2019", optional = true }
 year2024 = { path = "../year2024", optional = true }
 
 [features]
@@ -22,8 +23,8 @@ const_lut = ["year2024?/const_lut"]
 all-simd = ["utils/all-simd"]
 test-runner = []
 # xtask update features
-all-years = ["year2015", "year2016", "year2017", "year2018", "year2024"]
-unsafe = ["year2015?/unsafe", "year2016?/unsafe", "year2017?/unsafe", "year2018?/unsafe", "year2024?/unsafe", "utils/unsafe"]
+all-years = ["year2015", "year2016", "year2017", "year2018", "year2019", "year2024"]
+unsafe = ["year2015?/unsafe", "year2016?/unsafe", "year2017?/unsafe", "year2018?/unsafe", "year2019?/unsafe", "year2024?/unsafe", "utils/unsafe"]
 
 [lints]
 workspace = true

crates/aoc/Cargo.toml

@@ -27,6 +27,10 @@ pub mod year2017 {
 pub mod year2018 {
     pub use ::utils::puzzles_noop as puzzles;
 }
+#[cfg(not(feature = "year2019"))]
+pub mod year2019 {
+    pub use ::utils::puzzles_noop as puzzles;
+}
 #[cfg(not(feature = "year2024"))]
 pub mod year2024 {
     pub use ::utils::puzzles_noop as puzzles;
@@ -39,6 +43,8 @@ pub use ::year2016;
 pub use ::year2017;
 #[cfg(feature = "year2018")]
 pub use ::year2018;
+#[cfg(feature = "year2019")]
+pub use ::year2019;
 #[cfg(feature = "year2024")]
 pub use ::year2024;
 
@@ -111,6 +117,7 @@ macro_rules! all_puzzles {
                 $crate::year2016::puzzles,
                 $crate::year2017::puzzles,
                 $crate::year2018::puzzles,
+                $crate::year2019::puzzles,
                 $crate::year2024::puzzles,
 
                 $callback

crates/aoc/src/years.rs

@@ -0,0 +1,14 @@
+[package]
+name = "year2019"
+authors = { workspace = true }
+edition = { workspace = true }
+license = { workspace = true }
+publish = { workspace = true }
+repository = { workspace = true }
+rust-version = { workspace = true }
+
+[dependencies]
+utils = { path = "../utils", default-features = false }
+
+[features]
+unsafe = ["utils/unsafe"]

crates/year2019/Cargo.toml

@@ -0,0 +1 @@
+Solutions for [Advent of Code 2019](https://adventofcode.com/2019)

crates/year2019/README.md

@@ -0,0 +1,45 @@
+use utils::prelude::*;
+
+/// Summing values from a recursive formula.
+#[derive(Clone, Debug)]
+pub struct Day01 {
+    modules: Vec<u32>,
+}
+
+impl Day01 {
+    pub fn new(input: &str, _: InputType) -> Result<Self, InputError> {
+        Ok(Self {
+            modules: parser::u32().parse_lines(input)?,
+        })
+    }
+
+    #[must_use]
+    pub fn part1(&self) -> u32 {
+        self.modules
+            .iter()
+            .map(|mass| (mass / 3).saturating_sub(2))
+            .sum()
+    }
+
+    #[must_use]
+    pub fn part2(&self) -> u32 {
+        self.modules
+            .iter()
+            .map(|&(mut mass)| {
+                let mut fuel = 0;
+                while mass > 0 {
+                    mass = (mass / 3).saturating_sub(2);
+                    fuel += mass;
+                }
+                fuel
+            })
+            .sum()
+    }
+}
+
+examples!(Day01 -> (u32, u32) [
+    {input: "12", part1: 2, part2: 2},
+    {input: "14", part1: 2, part2: 2},
+    {input: "1969", part1: 654, part2: 966},
+    {input: "100756", part1: 33583, part2: 50346},
+]);

crates/year2019/src/day01.rs

@@ -0,0 +1,6 @@
+#![doc = include_str!("../README.md")]
+#![cfg_attr(not(feature = "unsafe"), forbid(unsafe_code))]
+
+utils::year!(2019 => year2019, ${
+    1 => day01::Day01,
+});