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use std::{num::ParseIntError, str::FromStr};
#[derive(Debug)]
struct Rng {
start: usize,
end: usize,
}
impl Rng {
fn intersects(&self, rng: &Rng) -> bool {
if self.start <= rng.end && rng.start <= self.end {
return true;
}
false
}
fn contains(&self, rng: &Rng) -> bool {
if self.start >= rng.start && self.end <= rng.end {
true
} else {
false
}
}
}
impl FromStr for Rng {
type Err = ParseIntError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (start, end) = s.split_once('-').unwrap();
let start_fromstr = start.parse::<usize>()?;
let end_fromstr = end.parse::<usize>()?;
Ok(Rng {
start: start_fromstr,
end: end_fromstr,
})
}
}
fn solve_part_one(data: &str) -> u32 {
data.lines()
.map(|line| -> u32 {
let l = line.split_once(',').unwrap();
let r1 = Rng::from_str(l.0).unwrap();
let r2 = Rng::from_str(l.1).unwrap();
(r1.contains(&r2) || r2.contains(&r1)) as u32
})
.sum()
}
fn solve_part_two(data: &str) -> u32 {
data.lines()
.map(|line| -> (Rng, Rng) {
let l = line.split_once(',').unwrap();
(Rng::from_str(l.0).unwrap(), Rng::from_str(l.1).unwrap())
})
.map(|rngs| rngs.0.intersects(&rngs.1) as u32)
.sum()
}
fn main() {
let data_test = include_str!("../input/day4.test");
let data_prod = include_str!("../input/day4.prod");
println!("{}", solve_part_one(data_test));
println!("{}", solve_part_two(data_test));
println!("{}", solve_part_one(data_prod));
println!("{}", solve_part_two(data_prod));
}
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