Add solution for 2022 day 01

.editorconfig

@@ -16,3 +16,6 @@ indent_size = 2
 
 [*.ml]
 indent_size = 2
+
+[*.txt]
+insert_final_newline = false

2022/.gitignore

@@ -0,0 +1 @@
+target/

2022/Justfile

@@ -0,0 +1,19 @@
+@_run_day DAY PART INPUT:
+    just \
+        --working-directory "./day-{{DAY}}" \
+        --justfile "./day-{{DAY}}/Justfile" \
+        part {{PART}} {{INPUT}}
+
+day DAYS="all" PARTS="one,two" INPUT_FILE="":
+    #!/usr/bin/env ruby
+    days = "{{DAYS}}" == "all" ? Dir["day-*"] : "{{DAYS}}".split(",")
+    input_file = "{{INPUT_FILE}}".then do |f|
+        (f.include?("/") || f.empty?) ? f : "inputs/#{f}.txt"
+    end
+    days.each do |day|
+        day = day.delete_prefix("day-")
+        "{{PARTS}}".split(",").each do |part|
+            part_num = part == "one" ? 1 : 2
+            puts "Day #{day}.#{part_num}: " + `just _run_day #{day} #{part} '#{input_file}'`
+        end
+    end

2022/README.md

@@ -0,0 +1,35 @@
+# [Advent of Code 2022](https://adventofcode.com/2022)
+
+## Progress
+
+| Day | Part 1 | Part 2 | Language |
+| :-: | :----: | :----: | :------- |
+| 01  |   ✓    |   ✓    | [Rust]   |
+| 02  |        |        |          |
+| 03  |        |        |          |
+| 04  |        |        |          |
+| 05  |        |        |          |
+| 06  |        |        |          |
+| 07  |        |        |          |
+| 08  |        |        |          |
+| 09  |        |        |          |
+| 10  |        |        |          |
+| 11  |        |        |          |
+| 12  |        |        |          |
+| 13  |        |        |          |
+| 14  |        |        |          |
+| 15  |        |        |          |
+| 16  |        |        |          |
+| 17  |        |        |          |
+| 18  |        |        |          |
+| 19  |        |        |          |
+| 20  |        |        |          |
+| 21  |        |        |          |
+| 22  |        |        |          |
+| 23  |        |        |          |
+| 24  |        |        |          |
+| 25  |        |        |          |
+
+<!-- links -->
+
+[rust]: https://www.rust-lang.org

2022/day-01/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc-2022-01"
+version = "0.1.0"

2022/day-01/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "aoc-2022-01"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

2022/day-01/Justfile

@@ -0,0 +1,5 @@
+@part PART INPUT_FILE="inputs/puzzle.txt":
+    cargo run --bin part{{PART}} -- {{INPUT_FILE}}
+
+clean:
+    cargo clean

2022/day-01/inputs/test.txt

@@ -0,0 +1,14 @@
+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000

2022/day-01/src/bin/part1.rs

@@ -0,0 +1,11 @@
+use std::{env, io};
+
+fn main() -> io::Result<()> {
+    let infile_path = env::args().nth(1).expect("input file");
+    let sums = aoc_2022_01::input_sums(infile_path)?;
+
+    let max = sums.max().unwrap();
+    println!("{max}");
+
+    Ok(())
+}

2022/day-01/src/bin/part2.rs

@@ -0,0 +1,12 @@
+use std::{env, io};
+
+fn main() -> io::Result<()> {
+    let infile_path = env::args().nth(1).expect("input file");
+    let mut sums = aoc_2022_01::input_sums(infile_path)?.collect::<Vec<_>>();
+
+    sums.sort_by(|a, b| b.partial_cmp(a).unwrap());
+    let three_highest_sum: &u32 = &sums[..3].iter().sum();
+    println!("{three_highest_sum}");
+
+    Ok(())
+}

2022/day-01/src/lib.rs

@@ -0,0 +1,44 @@
+use std::{
+    fs::File,
+    io::{self, BufRead, BufReader},
+    path::Path,
+};
+
+pub fn input_sums<P>(path: P) -> io::Result<impl Iterator<Item = u32>>
+where
+    P: AsRef<Path>,
+{
+    let inputs = parse_input_file(path)?;
+
+    let sums = inputs.into_iter().map(|val| val.into_iter().sum());
+
+    Ok(sums)
+}
+
+fn parse_input_file<P>(path: P) -> io::Result<Vec<Vec<u32>>>
+where
+    P: AsRef<Path>,
+{
+    let file = File::open(path)?;
+    let reader = BufReader::new(file);
+
+    let mut inputs = Vec::new();
+    let mut current = Vec::new();
+
+    for line in reader.lines() {
+        let line = line?;
+        if line.is_empty() {
+            inputs.push(current);
+            current = Vec::new();
+        } else {
+            let value = line.parse().expect("invalid number");
+            current.push(value);
+        }
+    }
+
+    if !current.is_empty() {
+        inputs.push(current);
+    }
+
+    Ok(inputs)
+}

README.md

@@ -9,3 +9,4 @@
 -   [2019](2019/README.md) (0% completed)
 -   [2020](2020/README.md) (20% completed)
 -   [2021](2021/README.md) (68% completed)
+-   [2022](2022/README.md) (4% completed)