From 4cdfe2fd7acb8f9b261557e1f6c513b17cbf76ef Mon Sep 17 00:00:00 2001 From: Russell Champoux Date: Fri, 16 Dec 2016 14:44:15 -0500 Subject: [PATCH] Day 15 solution --- 2016/day15/Cargo.lock | 187 +++++++++++++++++++++++++++++++++++++++++ 2016/day15/Cargo.toml | 8 ++ 2016/day15/src/main.rs | 75 +++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 2016/day15/Cargo.lock create mode 100644 2016/day15/Cargo.toml create mode 100644 2016/day15/src/main.rs diff --git a/2016/day15/Cargo.lock b/2016/day15/Cargo.lock new file mode 100644 index 0000000..05e6110 --- /dev/null +++ b/2016/day15/Cargo.lock @@ -0,0 +1,187 @@ +[root] +name = "day15" +version = "0.1.0" +dependencies = [ + "num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)", + "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "aho-corasick" +version = "0.5.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "memchr 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-> bool { + // a disk starts at position 'start' + // and ticks up to maximum position 'pos' then loops back to the first position + // a disk will be valid if it is at position 0 when hit + // there is a delay of seconds equal to the disc layer, or "id" + (disc.start + time + disc.id) % disc.pos == 0 +} + +fn get_discs(input: &String) -> Vec { + let mut discs: Vec = vec![]; + + let re = Regex::new(r"Disc #(\d+) has (\d+) positions; at time=0, it is at position (\d+)\.").unwrap(); + //read all discs + for line in input.lines() { + let cap = re.captures(line).unwrap(); + discs.push(Disc { + id: cap.at(1).unwrap().parse().unwrap(), + pos: cap.at(2).unwrap().parse().unwrap(), + start: cap.at(3).unwrap().parse().unwrap() + }); + } + //println!("Discs: {:?}", discs); + discs +} + +fn cycle_discs(discs: &Vec) { + //find full cycle length (through lowest common multiple of all disc positions) + let full_cycle = discs.iter().fold(1, |total, x| total.lcm(&x.pos)); + //println!("LCM {}", full_cycle); + //iterate through each cycle until you find a match + 'time_loop: for time in 0..full_cycle { + for disc in discs { + if !is_valid(disc, time) { + continue 'time_loop; + } + } + //we made it all the way through the discs! + println!("We made it at time={}", time); + break 'time_loop; + } +} + +fn main() { + let mut file = File::open("./data").expect("could not open file"); + let mut input = String::new(); + file.read_to_string(&mut input).expect("could not read file"); + + // Part 1 + print!("Part 1: "); + let mut discs = get_discs(&input); + cycle_discs(&discs); + + // Part 2 + print!("Part 2: "); + let new_id = (discs.len() + 1) as u32; + discs.push(Disc {id: new_id, pos: 11, start: 0 }); + cycle_discs(&discs); + +}