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author | June McEnroe <programble@gmail.com> | 2016-12-03 22:21:12 -0500 |
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committer | June McEnroe <programble@gmail.com> | 2016-12-03 22:21:12 -0500 |
commit | ae7815c1c6f5ed941ec8c5041ffe23cefd45d26f (patch) | |
tree | 4fce58e4f5e25d34085ac44f39b629b1740f88b8 /src/bin/day01.rs | |
parent | Cargo init (diff) | |
download | aoc-ae7815c1c6f5ed941ec8c5041ffe23cefd45d26f.tar.gz aoc-ae7815c1c6f5ed941ec8c5041ffe23cefd45d26f.zip |
Day 1 in Rust
Diffstat (limited to '')
-rw-r--r-- | src/bin/day01.rs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/bin/day01.rs b/src/bin/day01.rs index f79c691..ed2d845 100644 --- a/src/bin/day01.rs +++ b/src/bin/day01.rs @@ -1,2 +1,58 @@ +use std::io::{self, Read}; +use std::ops::{Add, Mul}; + +#[derive(Clone, Copy)] +struct Point(i32, i32); + +impl Point { + fn left(self) -> Self { + Point(self.1, -self.0) + } + + fn right(self) -> Self { + Point(-self.1, self.0) + } + + fn distance(self, other: Self) -> i32 { + (self.0 - other.0).abs() + (self.1 - other.1).abs() + } +} + +impl Add for Point { + type Output = Self; + + fn add(self, rhs: Self) -> Self { + Point(self.0 + rhs.0, self.1 + rhs.1) + } +} + +impl Mul<i32> for Point { + type Output = Self; + + fn mul(self, rhs: i32) -> Self { + Point(self.0 * rhs, self.1 * rhs) + } +} + fn main() { + let mut input = String::new(); + io::stdin().read_to_string(&mut input).unwrap(); + + let mut position = Point(0, 0); + let mut direction = Point(0, -1); + + for instruction in input.trim().split(", ") { + let (turn, count) = instruction.split_at(1); + + if turn == "L" { + direction = direction.left(); + } else { + direction = direction.right(); + } + + let count: i32 = count.parse().unwrap(); + position = position + direction * count; + } + + println!("Part 1: {}", position.distance(Point(0, 0))); } |