{"header":{"message":"Solution for 2020: day 2","description":null,"timestamp":"2021-12-06T23:10:18.434837Z","authors":[{"email":"quick.dudley@gmail.com","full_name":"Jeremy List","name":"quickdudley"}]},"hash":"IWN7EOTTMWUU5PNPMXDVZFKIVOUFFE47ELSC2YRBLCQHUZBV3EJQC","authors":[],"deps":{"hashes":[["IWN7EOTTMWUU5PNPMXDVZFKIVOUFFE47ELSC2YRBLCQHUZBV3EJQC","Solution for 2020: day 2"],["AA",null],["HUHAFQLN6Q6U7CPR2SPPEPLE5LMCR53UA2GJ7LUVSHFXQPCGIYAQC","2021 day 1"]],"deps":["HUHAFQLN6Q6U7CPR2SPPEPLE5LMCR53UA2GJ7LUVSHFXQPCGIYAQC"],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"day2.rs","metadata":0},"context":[{"change":2,"pos":16}],"contents":[{"Add":"use std::str::FromStr;"},{"Add":""},{"Add":"#[derive(Clone,Copy)]"},{"Add":"enum Direction {"},{"Add":" Forward,"},{"Add":" Up,"},{"Add":" Down"},{"Add":"}"},{"Add":"#[derive(Clone,Copy)]"},{"Add":"struct Instruction {"},{"Add":" direction: Direction,"},{"Add":" distance: i64,"},{"Add":"}"},{"Add":""},{"Add":"enum InstructionParseError {"},{"Add":" Direction,"},{"Add":" Distance(std::num::ParseIntError)"},{"Add":"}"},{"Add":""},{"Add":"impl From for InstructionParseError {"},{"Add":" fn from(src: std::num::ParseIntError) -> Self {"},{"Add":" Self::Distance(src)"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl FromStr for Instruction {"},{"Add":" type Err = InstructionParseError;"},{"Add":""},{"Add":" fn from_str(source: &str) -> Result {"},{"Add":" let mut words = source.split_whitespace();"},{"Add":" let ds = words.next().ok_or(InstructionParseError::Direction)?;"},{"Add":" let direction = match ds {"},{"Add":" \"forward\" => Ok(Direction::Forward),"},{"Add":" \"down\" => Ok(Direction::Down),"},{"Add":" \"up\" => Ok(Direction::Up),"},{"Add":" _ => Err(InstructionParseError::Direction)"},{"Add":" }?;"},{"Add":" let distance: i64 = words.next().unwrap_or_else(|| \"\")"},{"Add":" .parse()?;"},{"Add":" Ok(Self { direction, distance })"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"fn trace_1>(source: I) -> (i64,i64) {"},{"Add":" let mut x = 0;"},{"Add":" let mut y = 0;"},{"Add":" for i in source {"},{"Add":" match i.direction {"},{"Add":" Direction::Forward => { x += i.distance; }"},{"Add":" Direction::Up => { y -= i.distance; }"},{"Add":" Direction::Down => { y += i.distance; }"},{"Add":" }"},{"Add":" };"},{"Add":" (x,y)"},{"Add":"}"},{"Add":""},{"Add":"fn trace_2>(source: I) -> (i64,i64) {"},{"Add":" let mut aim: i64 = 0;"},{"Add":" let mut x = 0;"},{"Add":" let mut y = 0;"},{"Add":" for i in source {"},{"Add":" match i.direction {"},{"Add":" Direction::Forward => {"},{"Add":" x += i.distance;"},{"Add":" y += aim * i.distance;"},{"Add":" }"},{"Add":" Direction::Up => { aim -= i.distance; }"},{"Add":" Direction::Down => { aim += i.distance; }"},{"Add":" }"},{"Add":" };"},{"Add":" (x, y)"},{"Add":"}"},{"Add":""},{"Add":"fn main() {"},{"Add":" use std::io::BufRead;"},{"Add":" let args: Vec<_> = std::env::args().collect();"},{"Add":" let file = std::io::BufReader::new(std::fs::File::open(>::as_ref(&args[1])).unwrap());"},{"Add":" let instructions: Vec = file"},{"Add":" .lines()"},{"Add":" .flat_map(|line| line.ok().and_then(|line| str::parse::(line.as_ref()).ok()))"},{"Add":" .collect();"},{"Add":" let (x1, y1) = trace_1(instructions.iter().map(|x| *x));"},{"Add":" println!(\"Version 1:\");"},{"Add":" println!(\"x: {}; y: {}; product: {}\", x1, y1, x1 * y1);"},{"Add":" let (x2, y2) = trace_2(instructions.iter().map(|x| *x));"},{"Add":" println!(\"\");"},{"Add":" println!(\"Version 2:\");"},{"Add":" println!(\"x: {}; y: {}; product: {}\", x2, y2, x2 * y2);"},{"Add":"}"}]}},{"Edit":{"inode":{"change":2,"pos":3108},"path":"2021/Cargo.toml","line":13,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":3326}],"down_context":[],"flag":"BLOCK","start":2575,"end":2615,"inode":{"change":2,"pos":3108}}},"contents":[{"Add":""},{"Add":"[[bin]]"},{"Add":"name = \"day2\""},{"Add":"path = \"day2.rs\""}]}}],"owner":"quickdudley","repo":"adventofcode","token":"f8KaGP4eykLuM1KLG52lDVkiTy/0hAmj0YrBLHGUDMQ=","login":null}

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