2021 day 2 rust
This commit is contained in:
parent
4832842f24
commit
75fce67d69
35
2021/rust/Cargo.lock
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35
2021/rust/Cargo.lock
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@ -2,6 +2,41 @@
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "aho-corasick"
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version = "0.7.20"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
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dependencies = [
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"memchr",
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]
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[[package]]
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name = "memchr"
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version = "2.5.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
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[[package]]
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name = "regex"
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version = "1.7.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e076559ef8e241f2ae3479e36f97bd5741c0330689e217ad51ce2c76808b868a"
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dependencies = [
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"aho-corasick",
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"memchr",
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"regex-syntax",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.6.28"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
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[[package]]
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name = "rust"
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version = "0.1.0"
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dependencies = [
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"regex",
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]
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@ -6,3 +6,4 @@ edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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regex = "1"
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1000
2021/rust/inputs/day02.txt
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1000
2021/rust/inputs/day02.txt
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File diff suppressed because it is too large
Load diff
6
2021/rust/inputs/scratch.txt
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6
2021/rust/inputs/scratch.txt
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@ -0,0 +1,6 @@
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forward 5
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down 5
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forward 8
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up 3
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down 8
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forward 2
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@ -3,5 +3,5 @@ mod solutions;
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fn main() {
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solutions::day01::run();
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solutions::day02::run();
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}
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@ -1,9 +1,9 @@
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use crate::utils;
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use crate::utils::Day;
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use crate::utils::Source;
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pub fn run() -> () {
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let data = parse_data(utils::read_lines(Day(1)));
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let data = parse_data(utils::read_lines(Source::Day(1)));
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println!("Day 1");
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println!("Part 1: {}", solve1(&data));
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58
2021/rust/src/solutions/day02.rs
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58
2021/rust/src/solutions/day02.rs
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use regex::{Captures, Regex};
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use crate::utils;
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use crate::utils::Source;
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pub fn run() -> () {
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let data = parse_data(utils::read_lines(Source::Day(2)));
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println!("Day 2");
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println!("Part 1: {}", solve1(&data));
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println!("Part 2: {}", solve2(&data));
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}
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enum Command {
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Forward(i32),
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Down(i32),
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Up(i32),
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}
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fn solve1(lines: &Vec<Command>) -> i32 {
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let (x, depth) = lines.iter()
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.fold((0, 0), |(x, depth), next| match next {
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Command::Forward(val) => (x + val, depth),
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Command::Down(val) => (x, depth + val),
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Command::Up(val) => (x, depth - val),
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});
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x * depth
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}
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fn solve2(lines: &Vec<Command>) -> i32 {
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let (x, depth, aim) = lines.iter()
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.fold((0, 0, 0), |(x, depth, aim), next| match next {
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Command::Forward(val) => (x + val, depth + (aim * val), aim),
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Command::Down(val) => (x, depth, aim + val),
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Command::Up(val) => (x, depth, aim - val),
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});
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x * depth
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}
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fn parse_data(lines: Vec<String>) -> Vec<Command> {
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let re = Regex::new(r"^(\w+) (\d+)$").unwrap();
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lines.iter()
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.map(|line| re.captures(line).unwrap())
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.map(to_command)
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.collect::<Vec<_>>()
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}
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fn to_command(cap: Captures) -> Command {
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let left = cap.get(1).unwrap().as_str();
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let right = cap.get(2).unwrap().as_str().parse().unwrap();
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match left {
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"forward" => Command::Forward(right),
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"up" => Command::Up(right),
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"down" => Command::Down(right),
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_ => panic!("Unknown command")
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}
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}
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@ -1 +1,2 @@
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pub mod day01;
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pub mod day02;
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@ -3,14 +3,18 @@ use std::io::{BufRead, BufReader};
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use std::path::Path;
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#[repr(transparent)]
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pub struct Day(pub i32);
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pub enum Source { Scratch, Day(i32) }
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pub fn read_lines(day: Day) -> Vec<String> {
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assert!(1 <= day.0 && day.0 < 25);
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_read_lines(format!("inputs/day{:0>2}.txt", day.0))
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.expect(format!("Failed to load day {}", day.0).as_str())
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pub fn read_lines(source: Source) -> Vec<String> {
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let path = match source {
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Source::Scratch => "inputs/scratch.txt".to_string(),
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Source::Day(day) => {
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assert!(1 <= day && day < 25);
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format!("inputs/day{:0>2}.txt", day)
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}
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};
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_read_lines(&path).expect(format!("Failed to load from {}", &path).as_str())
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}
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fn _read_lines<P>(filename: P) -> std::io::Result<Vec<String>>
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