38 lines
1001 B
Rust
38 lines
1001 B
Rust
use std::error::Error;
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use std::fs::File;
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use std::io::{self, BufRead};
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use std::vec::Vec;
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fn to_moves(line: String) -> (i32, i32) {
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let mut parts = line.split(" ");
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let dir = parts.nth(0).unwrap();
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let arg: i32 = parts.nth(0).unwrap().parse().unwrap();
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match dir {
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"up" => (0, -arg),
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"down" => (0, arg),
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"forward" => (arg, 0),
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_ => panic!("Unsupported Direction: {}", dir),
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}
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}
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fn main() -> Result<(), Box<dyn Error>> {
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let file = File::open("inputs/day2.txt")?;
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let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
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let moves: Vec<(i32, i32)> = lines.map(|l| to_moves(l)).collect();
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let pos = moves
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.iter()
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.fold((0, 0), |(ax, ay), (bx, by)| (ax + bx, ay + by));
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println!("Answer1: {}", pos.0 * pos.1);
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let pos = moves.iter().fold((0, 0, 0), |(x, y, aim), (mx, maim)| {
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(x + mx, y + mx * (maim + aim), aim + maim)
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});
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println!("Answer2: {}", pos.0 * pos.1);
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Ok(())
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}
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