diff options
Diffstat (limited to 'src/2020')
-rw-r--r-- | src/2020/1/mod.rs | 27 | ||||
-rw-r--r-- | src/2020/mod.rs | 51 |
2 files changed, 31 insertions, 47 deletions
diff --git a/src/2020/1/mod.rs b/src/2020/1/mod.rs new file mode 100644 index 0000000..8aa5290 --- /dev/null +++ b/src/2020/1/mod.rs @@ -0,0 +1,27 @@ +pub fn part1() -> anyhow::Result<()> { + let ints = crate::util::read_ints("data/1.txt")?; + for i in &ints { + for j in &ints { + if i + j == 2020 { + println!("{} * {} = {}", i, j, i * j); + return Ok(()); + } + } + } + Err(anyhow::anyhow!("no numbers summing to 2020 found")) +} + +pub fn part2() -> anyhow::Result<()> { + let ints = crate::util::read_ints("data/1.txt")?; + for i in &ints { + for j in &ints { + for k in &ints { + if i + j + k == 2020 { + println!("{} * {} * {} = {}", i, j, k, i * j * k); + return Ok(()); + } + } + } + } + Err(anyhow::anyhow!("no numbers summing to 2020 found")) +} diff --git a/src/2020/mod.rs b/src/2020/mod.rs index 27e56fc..3800c30 100644 --- a/src/2020/mod.rs +++ b/src/2020/mod.rs @@ -1,53 +1,10 @@ -use anyhow::Context as _; -use std::io::BufRead as _; +#[path = "1/mod.rs"] +mod day1; pub fn run(day: u8, puzzle: u8) -> anyhow::Result<()> { match (day, puzzle) { - (1, 1) => report_repair(), - (1, 2) => report_repair_2(), + (1, 1) => day1::part1(), + (1, 2) => day1::part2(), _ => Err(anyhow::anyhow!("unknown puzzle {}-{}", day, puzzle)), } } - -fn report_repair() -> anyhow::Result<()> { - let ints = read_ints("data/1.txt")?; - for i in &ints { - for j in &ints { - if i + j == 2020 { - println!("{} * {} = {}", i, j, i * j); - return Ok(()); - } - } - } - Err(anyhow::anyhow!("no numbers summing to 2020 found")) -} - -fn report_repair_2() -> anyhow::Result<()> { - let ints = read_ints("data/1.txt")?; - for i in &ints { - for j in &ints { - for k in &ints { - if i + j + k == 2020 { - println!("{} * {} * {} = {}", i, j, k, i * j * k); - return Ok(()); - } - } - } - } - Err(anyhow::anyhow!("no numbers summing to 2020 found")) -} - -fn read_ints(filename: &str) -> anyhow::Result<Vec<i32>> { - let f = std::fs::File::open(filename) - .with_context(|| format!("couldn't find data file {}", filename))?; - let f = std::io::BufReader::new(f); - let ints: anyhow::Result<Vec<i32>> = f - .lines() - .map(|l| { - l.context("failed to read a line")? - .parse() - .context("failed to parse line into an integer") - }) - .collect(); - ints -} |