diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/day4.rs | 27 | ||||
| -rw-r--r-- | src/main.rs | 3 |
2 files changed, 30 insertions, 0 deletions
diff --git a/src/day4.rs b/src/day4.rs new file mode 100644 index 0000000..46b9077 --- /dev/null +++ b/src/day4.rs @@ -0,0 +1,27 @@ +pub fn run(input: String) { + let count_overlaps = input.lines().map(|line| { + let (r1s, r2s) = line.split_once(",").expect("couldn't split on comma"); + let (r1starts,r1ends) = r1s.split_once("-").expect("r1s no delimiter -"); + let (r2starts,r2ends) = r2s.split_once("-").expect("r2s no delimiter -"); + let r1start: u32 = r1starts.parse().expect("r1starts not a u32"); + let r1end: u32 = r1ends.parse().expect("r1ends not a u32"); + let r2start: u32 = r2starts.parse().expect("r2starts not a u32"); + let r2end: u32 = r2ends.parse().expect("r2ends not a u32"); + // fully contained (i.e. r1 is fully inside r2 or vice versa) + //let b1in2 = r1start >= r2start && r1end <= r2end; + //let b2in1 = r2start >= r1start && r2end <= r1end; + //return b1in2 || b2in1; + + // partially contained (i.e. at least one end of r1 is contained in r2, or vice versa) + let e1 = r1start >= r2start && r1start <= r2end; + let e2 = r1end >= r2start && r1end <= r2end; + let e3 = r2start >= r1start && r2start <= r1end; + let e4 = r2end >= r1start && r2end <= r1end; + let res = e1 || e2 || e3 || e4; + //println!("{}: {}", line, res); + res + }) + .filter(|x| {*x}) + .count(); + println!("Day 4: {}", count_overlaps); +}
\ No newline at end of file diff --git a/src/main.rs b/src/main.rs index 79c5970..c257999 100644 --- a/src/main.rs +++ b/src/main.rs @@ -4,8 +4,11 @@ mod day1; mod day2; mod day3; +mod day4; + fn main() { day1::run(fs::read_to_string("input/day1.txt").expect("Failed to read input file!")); day2::run(fs::read_to_string("input/day2.txt").expect("Failed to read input file!")); day3::run(fs::read_to_string("input/day3.txt").expect("Failed to read input file!")); + day4::run(fs::read_to_string("input/day4.txt").expect("Failed to read input file!")); } |