{"header":{"message":"Day 3 solutions","description":null,"timestamp":"2020-12-15T02:25:29Z","authors":[{"email":"jeremy.list@youdo.co.nz","name":"Jeremy List"}]},"hash":"S5HFKJ5P5YDRR6VIMLZJSX34BJJUPVQSRFFMA22WU2NZTTAZM2EQC","authors":[],"deps":{"hashes":[["S5HFKJ5P5YDRR6VIMLZJSX34BJJUPVQSRFFMA22WU2NZTTAZM2EQC","Day 3 solutions"],["AA",null],["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC","Solve day 1 for 2020"]],"deps":["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC"],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"day3.rs","metadata":0},"context":[{"change":2,"pos":17}],"contents":[{"Add":"use std::env;"},{"Add":"use std::io::BufRead;"},{"Add":""},{"Add":"#[derive(Debug,Copy,Clone)]"},{"Add":"enum Tile {"},{"Add":" Blank,"},{"Add":" Tree,"},{"Add":"}"},{"Add":""},{"Add":"struct Pairs {"},{"Add":" inner: I,"},{"Add":"}"},{"Add":""},{"Add":"impl Pairs {"},{"Add":" fn new(inner: I) -> Self {"},{"Add":" Pairs { inner: inner, }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl Iterator for Pairs"},{"Add":"where I: Iterator {"},{"Add":" type Item = (::Item, ::Item);"},{"Add":" fn next(&mut self) -> Option {"},{"Add":" let a = self.inner.next()?;"},{"Add":" let b = self.inner.next()?;"},{"Add":" Some((a,b))"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"fn tile(c: char) -> Tile {"},{"Add":" match c {"},{"Add":" '.' => Tile::Blank,"},{"Add":" '#' => Tile::Tree,"},{"Add":" _ => panic!(\"Unrecognized tile\")"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"fn trees_hit(grid: &Vec>, dx: usize, dy: usize) -> u64 {"},{"Add":" let mut count = 0;"},{"Add":" let mut x = 0;"},{"Add":" for row in grid.iter().step_by(dy) {"},{"Add":" match row[x % row.len()] {"},{"Add":" Tile::Blank => {},"},{"Add":" Tile::Tree => {count += 1;},"},{"Add":" };"},{"Add":" x += dx;"},{"Add":" }"},{"Add":" count"},{"Add":"}"},{"Add":""},{"Add":"fn main() {"},{"Add":" let args: Vec<_> = env::args().collect();"},{"Add":" let grid: Vec> = std::io::BufReader::new(std::fs::File::open(&args[1]).unwrap())"},{"Add":" .lines()"},{"Add":" .map(Result::unwrap)"},{"Add":" .map(|l| l"},{"Add":" .chars()"},{"Add":" .map(tile)"},{"Add":" .collect()"},{"Add":" )"},{"Add":" .collect();"},{"Add":" let slopes: Vec<(usize,usize)> = Pairs::new(args[2]"},{"Add":" .split(\",\")"},{"Add":" .map(|s| s.parse::().unwrap())"},{"Add":" ).collect();"},{"Add":""},{"Add":" println!(\"{}\", slopes.iter()"},{"Add":" .map(|(dx,dy)| trees_hit(&grid, *dx, *dy))"},{"Add":" .product::()"},{"Add":" );"},{"Add":"}"}]}}],"owner":"quickdudley","repo":"adventofcode","token":"sKUe24g2f725xwHDr1kUAxaVfi5c6Yxp3lQ2ZnQcWQ0=","login":null}

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