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static DAY: u8 = 4;
fn main() {
let input = advent::read_lines(DAY);
println!("{DAY}a: {}", overlaps(&input, true));
println!("{DAY}b: {}", overlaps(&input, false));
}
struct Range {
start: u32,
end: u32,
}
impl Range {
fn new(input: &str) -> Range {
let (start, end) = input.split_once('-').unwrap();
let start = start.parse::<u32>().unwrap();
let end = end.parse::<u32>().unwrap();
Range { start, end }
}
fn overlaps(&self, other: &Range, fully_contained: bool) -> bool {
if fully_contained {
self.start <= other.start && self.end >= other.end
} else {
self.start <= other.start && self.end >= other.start
}
}
}
fn overlaps(input: &[String], fully_contained: bool) -> u32 {
let mut count = 0;
for line in input {
let (range1, range2) = line.split_once(',').unwrap();
let range1 = Range::new(range1);
let range2 = Range::new(range2);
if range1.overlaps(&range2, fully_contained) || range2.overlaps(&range1, fully_contained) {
count += 1;
}
}
count
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let input = [
"2-4,6-8".to_string(),
"2-3,4-5".to_string(),
"5-7,7-9".to_string(),
"2-8,3-7".to_string(),
"6-6,4-6".to_string(),
"2-6,4-8".to_string(),
];
assert_eq!(overlaps(&input, true), 2);
assert_eq!(overlaps(&input, false), 4);
}
}
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