diff options
author | June McEnroe <programble@gmail.com> | 2017-12-15 14:58:34 -0500 |
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committer | June McEnroe <programble@gmail.com> | 2017-12-15 14:58:34 -0500 |
commit | 581e6ab565f53e4b4b715a76d5c2fb8399fc73b5 (patch) | |
tree | 52b4358cb3bcc40fd48493a5db06ad013c1e4367 | |
parent | Day 10, part 2 (diff) | |
download | aoc-581e6ab565f53e4b4b715a76d5c2fb8399fc73b5.tar.gz aoc-581e6ab565f53e4b4b715a76d5c2fb8399fc73b5.zip |
Day 11
https://www.redblobgames.com/grids/hexagons/#coordinates-cube
-rw-r--r-- | 2017/input/day11.txt | 1 | ||||
-rw-r--r-- | 2017/src/bin/day11.rs | 42 |
2 files changed, 43 insertions, 0 deletions
diff --git a/2017/input/day11.txt b/2017/input/day11.txt new file mode 100644 index 0000000..ce4568b --- /dev/null +++ b/2017/input/day11.txt @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/2017/src/bin/day11.rs b/2017/src/bin/day11.rs new file mode 100644 index 0000000..174f950 --- /dev/null +++ b/2017/src/bin/day11.rs @@ -0,0 +1,42 @@ +use std::io::{self, Read}; + +#[derive(Debug, Clone, Copy)] +struct Hex(i32, i32, i32); + +impl Hex { + fn mov(self, dir: &str) -> Self { + let Hex(x, y, z) = self; + match dir { + "n" => Hex(x, y + 1, z - 1), + "ne" => Hex(x + 1, y, z - 1), + "se" => Hex(x + 1, y - 1, z), + "s" => Hex(x, y - 1, z + 1), + "sw" => Hex(x - 1, y, z + 1), + "nw" => Hex(x - 1, y + 1, z), + _ => unimplemented!(), + } + } +} + +fn solve1(input: &str) -> i32 { + let mut hex = Hex(0, 0, 0); + for dir in input.split(',') { + hex = hex.mov(dir); + } + (hex.0.abs() + hex.1.abs() + hex.2.abs()) / 2 +} + +fn main() { + let mut input = String::new(); + io::stdin().read_to_string(&mut input).unwrap(); + + println!("Part 1: {}", solve1(input.trim())); +} + +#[test] +fn part1() { + assert_eq!(3, solve1("ne,ne,ne")); + assert_eq!(0, solve1("ne,ne,sw,sw")); + assert_eq!(2, solve1("ne,ne,s,s")); + assert_eq!(3, solve1("se,sw,se,sw,sw")); +} |