aoc-rs-2021/src/day_17/mod.rs

mod model;
mod parsing;

use aoc_runner_derive::{aoc, aoc_generator};
pub use model::{Probe, TargetArea};
pub use parsing::parse_target_area;
use yap::IntoTokens;

#[aoc_generator(day17)]
pub fn parse_input(input: &str) -> TargetArea {
    parse_target_area(&mut input.into_tokens()).unwrap()
}

#[aoc(day17, part1)]
pub fn part1(input: &TargetArea) -> usize {
    let y = input.get_highest_possible_y_velocity().unwrap();

    let mut ret_val = 0;
    for i in 1..=y {
        ret_val += i
    }
    ret_val as usize
}

#[aoc(day17, part2)]
pub fn part2(input: &TargetArea) -> usize {
    input.get_all_possible_velocities().len()
}

#[cfg(test)]
mod test {

    const EXAMPLE_INPUT: &str = "target area: x=20..30, y=-10..-5";
    const RESULT_PART_1: usize = 45;
    const RESULT_PART_2: usize = 112;

    #[test]
    fn part1_example() {
        let result = super::part1(&super::parse_input(EXAMPLE_INPUT));
        assert_eq!(result, RESULT_PART_1);
    }

    #[test]
    fn part2_example() {
        let result = super::part2(&super::parse_input(EXAMPLE_INPUT));
        assert_eq!(result, RESULT_PART_2);
    }

    #[test]
    fn parse_example() {
        super::parse_input(EXAMPLE_INPUT);
    }
}