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day2 solution

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swaits committed 2021-12-01 22:55:12 -07:00
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data/day02-test.txt
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src/day02.rs
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use crate::utils::read_file;
use anyhow::Result;
fn parse_line(s: &str) -> (&str, i32) {
let parsed: Vec<&str> = s.splitn(2, ' ').collect();
let instruction = parsed[0];
let quantity = parsed[1].parse::<i32>().unwrap();
(instruction, quantity)
}
fn follow_course(s: &str) -> i32 {
let (mut pos, mut depth) = (0, 0);
s.lines().for_each(|line| match parse_line(line) {
("forward", d) => pos += d,
("down", d) => depth += d,
("up", d) => depth -= d,
_ => unreachable!(),
});
pos * depth
}
fn follow_course_better(s: &str) -> i32 {
let (mut pos, mut depth, mut aim) = (0, 0, 0);
s.lines().for_each(|line| match parse_line(line) {
("forward", d) => {
pos += d;
depth += aim * d;
}
("down", d) => aim += d,
("up", d) => aim -= d,
_ => unreachable!(),
});
pos * depth
}
pub(crate) fn run() -> Result<(usize, usize)> {
let input = read_file("data/day02.txt")?;
Ok((
follow_course(&input) as usize,
follow_course_better(&input) as usize,
))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_example() {
let input = read_file("data/day02-test.txt").unwrap();
assert_eq!(follow_course(&input), 150);
assert_eq!(follow_course_better(&input), 900);
}
#[test]
fn test_my_data() {
let input = read_file("data/day02.txt").unwrap();
assert_eq!(follow_course(&input), 2070300);
assert_eq!(follow_course_better(&input), 2078985210);
}
}
src/main.rs
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use anyhow::Result;
mod day01;
mod day02;
mod utils;
fn main() -> Result<()> {
println!("day01: {:?}", day01::run()?);
println!("day02: {:?}", day02::run()?);
Ok(())
}