diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/day5.rs | 65 | ||||
| -rw-r--r-- | src/main.rs | 3 |
2 files changed, 67 insertions, 1 deletions
diff --git a/src/day5.rs b/src/day5.rs new file mode 100644 index 0000000..806ddf2 --- /dev/null +++ b/src/day5.rs @@ -0,0 +1,65 @@ +use std::{collections::HashMap}; +use regex::Regex; + +pub fn run(input: String) { + let lines: Vec<&str> = input.lines().collect(); + let mut lix: usize = 0; + let mut ship: HashMap<usize, Vec<char>> = HashMap::new(); + for line in lines.iter() { + lix += 1; + let chrs: Vec<char> = line.chars().collect(); + // Line with just container numbers after the containers themselves + if chrs[1] == '1' { + break; + } + for (ix, container) in chrs.chunks(4).enumerate() { + let stack = ship.entry(ix+1).or_insert(Vec::new());// key starts at 1, of course + let payload = container[1]; + if payload.is_alphabetic() { + stack.insert(0, payload) // last one we found is always the bottom of the stack + } + } + } + println!("ship: {:?}", ship); + lix += 1; + + + let re = Regex::new(r"^move (\d+) from (\d+) to (\d+)$").unwrap(); + assert!(re.is_match("move 1 from 2 to 4")); + for line in lines[lix..].iter() { + // parse the instruction... + // "move 1 from 2 to 1" + + let mm = re.captures(line).expect("instruction didn't match regex???"); + let n: usize = mm.get(1).unwrap().as_str().parse().unwrap(); + let ifrom: usize = mm.get(2).unwrap().as_str().parse().unwrap(); + let ito: usize = mm.get(3).unwrap().as_str().parse().unwrap(); + println!("moving {} from {} to {}", n, ifrom, ito); + // for _ in 0..n { + // let stackfrom = ship.get_mut(&ifrom).expect("couldn't find stack to pop from!"); + // let ch = stackfrom.pop().expect("failed to pop from stack! maybe it was empty?"); + // let stackto = ship.get_mut(&ito).expect("couldn't find stack to push to!"); + // stackto.push(ch); + // } + let stackfrom = ship.get_mut(&ifrom).expect("couldn't find stack to pop from!"); + let mut chunk: Vec<char> = Vec::new(); + for _ in 0..n { + let ch = stackfrom.pop().expect("failed to pop from stack! maybe it was empty?"); + chunk.push(ch); + } + let stackto = ship.get_mut(&ito).expect("couldn't find stack to push to!"); + for _ in 0..n { + let ch = chunk.pop().unwrap(); + stackto.push(ch); + } + } + + print!("day 5: "); + for i in 1..(ship.keys().len()+1) { + let topch = ship.get(&i).unwrap().last().unwrap(); + print!("{}", topch); + } + print!("\n"); + + +}
\ No newline at end of file diff --git a/src/main.rs b/src/main.rs index c257999..12aa4b2 100644 --- a/src/main.rs +++ b/src/main.rs @@ -3,12 +3,13 @@ use std::fs; mod day1; mod day2; mod day3; - mod day4; +mod day5; 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!")); + day5::run(fs::read_to_string("input/day5.txt").expect("Failed to read input file!")); } |