Completed day 12
This commit is contained in:
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143
day12/Cargo.lock
generated
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143
day12/Cargo.lock
generated
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@ -0,0 +1,143 @@
|
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# This file is automatically @generated by Cargo.
|
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# It is not intended for manual editing.
|
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[[package]]
|
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name = "aho-corasick"
|
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version = "0.7.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
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name = "autocfg"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "day12"
|
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version = "0.1.0"
|
||||
dependencies = [
|
||||
"lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"num 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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|
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||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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dependencies = [
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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[[package]]
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name = "num-iter"
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
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dependencies = [
|
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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|
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"num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-rational"
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version = "0.2.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
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dependencies = [
|
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"autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-bigint 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
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|
||||
[[package]]
|
||||
name = "num-traits"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"regex-syntax 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "thread_local"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3197e20c7edb283f87c071ddfc7a2cca8f8e0b888c242959846a6fce03c72223"
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12
day12/Cargo.toml
Normal file
12
day12/Cargo.toml
Normal file
@ -0,0 +1,12 @@
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[package]
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name = "day12"
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version = "0.1.0"
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authors = ["Tyler Hallada <tyler@hallada.net>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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lazy_static = "1.4.0"
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num = "0.2.1"
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regex = "1.3.3"
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4
day12/input/input.txt
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4
day12/input/input.txt
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@ -0,0 +1,4 @@
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<x=3, y=2, z=-6>
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<x=-13, y=18, z=10>
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<x=-8, y=-1, z=13>
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<x=5, y=10, z=4>
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4
day12/input/test1.txt
Normal file
4
day12/input/test1.txt
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@ -0,0 +1,4 @@
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<x=-1, y=0, z=2>
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<x=2, y=-10, z=-7>
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<x=4, y=-8, z=8>
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<x=3, y=5, z=-1>
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4
day12/input/test2.txt
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4
day12/input/test2.txt
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@ -0,0 +1,4 @@
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<x=-8, y=-10, z=0>
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<x=5, y=5, z=10>
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<x=2, y=-7, z=3>
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<x=9, y=-8, z=-3>
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418
day12/src/main.rs
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418
day12/src/main.rs
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@ -0,0 +1,418 @@
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#[macro_use]
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extern crate lazy_static;
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use std::collections::HashSet;
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use std::error::Error;
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use std::fs::File;
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use std::io::{prelude::*, BufReader};
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use std::ops::AddAssign;
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use std::ops::Index;
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use std::result;
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use std::str::FromStr;
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use num::integer::lcm;
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use regex::Regex;
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type Result<T> = result::Result<T, Box<dyn Error>>;
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const INPUT: &str = "input/input.txt";
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#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
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struct Vector {
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x: i64,
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y: i64,
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z: i64,
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}
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#[derive(Debug, PartialEq, Eq, Hash, Clone)]
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struct Body {
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position: Vector,
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velocity: Vector,
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}
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#[derive(Debug, PartialEq, Eq, Hash, Clone)]
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struct NBody {
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bodies: Vec<Body>,
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}
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impl FromStr for Body {
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type Err = Box<dyn Error>;
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fn from_str(s: &str) -> Result<Body> {
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lazy_static! {
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static ref RE: Regex =
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Regex::new(r"<x=(?P<x>-?\d+), y=(?P<y>-?\d+), z=(?P<z>-?\d+)>").unwrap();
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}
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let captures = match RE.captures(s) {
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None => {
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return Err(From::from("Malformed scan, no positions could be found"));
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}
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Some(captures) => captures,
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};
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Ok(Body {
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position: Vector {
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x: captures["x"].parse()?,
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y: captures["y"].parse()?,
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z: captures["z"].parse()?,
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},
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velocity: Vector::new(),
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})
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}
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}
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impl Vector {
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fn new() -> Vector {
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Vector { x: 0, y: 0, z: 0 }
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}
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}
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|
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impl AddAssign for Vector {
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fn add_assign(&mut self, other: Self) {
|
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*self = Self {
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x: self.x + other.x,
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y: self.y + other.y,
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z: self.z + other.z,
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}
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}
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}
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impl Index<&str> for Vector {
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type Output = i64;
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fn index(&self, index: &str) -> &i64 {
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match index {
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"x" => &self.x,
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"y" => &self.y,
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"z" => &self.z,
|
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_ => panic!("unknown field: {}", index),
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}
|
||||
}
|
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}
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impl Body {
|
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fn add_gravity(&self, gravity: &mut Vector, other: &Self) {
|
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if self.position.x > other.position.x {
|
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gravity.x -= 1;
|
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} else if self.position.x < other.position.x {
|
||||
gravity.x += 1;
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}
|
||||
|
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if self.position.y > other.position.y {
|
||||
gravity.y -= 1;
|
||||
} else if self.position.y < other.position.y {
|
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gravity.y += 1;
|
||||
}
|
||||
|
||||
if self.position.z > other.position.z {
|
||||
gravity.z -= 1;
|
||||
} else if self.position.z < other.position.z {
|
||||
gravity.z += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl NBody {
|
||||
fn run_step(&mut self) {
|
||||
let mut gravities = Vec::new();
|
||||
for body in self.bodies.iter() {
|
||||
let mut gravity = Vector::new();
|
||||
for other_body in self.bodies.iter() {
|
||||
body.add_gravity(&mut gravity, other_body);
|
||||
}
|
||||
gravities.push(gravity);
|
||||
}
|
||||
|
||||
for (index, gravity) in gravities.into_iter().enumerate() {
|
||||
self.bodies[index].velocity += gravity;
|
||||
let velocity = self.bodies[index].velocity;
|
||||
self.bodies[index].position += velocity;
|
||||
}
|
||||
}
|
||||
|
||||
fn total_energy(&self) -> i64 {
|
||||
let mut total_energy = 0;
|
||||
for body in self.bodies.iter() {
|
||||
let potential_energy =
|
||||
body.position.x.abs() + body.position.y.abs() + body.position.z.abs();
|
||||
let kinetic_energy =
|
||||
body.velocity.x.abs() + body.velocity.y.abs() + body.velocity.z.abs();
|
||||
total_energy += potential_energy * kinetic_energy;
|
||||
}
|
||||
total_energy
|
||||
}
|
||||
|
||||
fn state(&self, component: &str) -> [(i64, i64); 4] {
|
||||
[
|
||||
(
|
||||
self.bodies[0].position[component],
|
||||
self.bodies[0].velocity[component],
|
||||
),
|
||||
(
|
||||
self.bodies[1].position[component],
|
||||
self.bodies[1].velocity[component],
|
||||
),
|
||||
(
|
||||
self.bodies[2].position[component],
|
||||
self.bodies[2].velocity[component],
|
||||
),
|
||||
(
|
||||
self.bodies[3].position[component],
|
||||
self.bodies[3].velocity[component],
|
||||
),
|
||||
]
|
||||
}
|
||||
}
|
||||
|
||||
fn read_moon_scan(filename: &str) -> Result<NBody> {
|
||||
let file = File::open(filename)?;
|
||||
let reader = BufReader::new(file);
|
||||
let mut moons = vec![];
|
||||
|
||||
for line in reader.lines() {
|
||||
moons.push(line?.parse()?);
|
||||
}
|
||||
|
||||
Ok(NBody { bodies: moons })
|
||||
}
|
||||
|
||||
fn solve_part1(filename: &str) -> Result<i64> {
|
||||
let mut nbody = read_moon_scan(filename)?;
|
||||
for _ in 0..1000 {
|
||||
nbody.run_step();
|
||||
}
|
||||
Ok(nbody.total_energy())
|
||||
}
|
||||
|
||||
fn solve_part2(filename: &str) -> Result<u64> {
|
||||
let mut step_count = 0;
|
||||
let mut x_states: HashSet<[(i64, i64); 4]> = HashSet::new();
|
||||
let mut y_states: HashSet<[(i64, i64); 4]> = HashSet::new();
|
||||
let mut z_states: HashSet<[(i64, i64); 4]> = HashSet::new();
|
||||
let mut x_repeated_step_count = None;
|
||||
let mut y_repeated_step_count = None;
|
||||
let mut z_repeated_step_count = None;
|
||||
let mut nbody = read_moon_scan(filename)?;
|
||||
while x_repeated_step_count == None
|
||||
|| y_repeated_step_count == None
|
||||
|| z_repeated_step_count == None
|
||||
{
|
||||
if x_repeated_step_count == None {
|
||||
let x_state = nbody.state("x");
|
||||
if x_states.contains(&x_state) {
|
||||
x_repeated_step_count = Some(step_count);
|
||||
} else {
|
||||
x_states.insert(x_state);
|
||||
}
|
||||
}
|
||||
|
||||
if y_repeated_step_count == None {
|
||||
let y_state = nbody.state("y");
|
||||
if y_states.contains(&y_state) {
|
||||
y_repeated_step_count = Some(step_count);
|
||||
} else {
|
||||
y_states.insert(y_state);
|
||||
}
|
||||
}
|
||||
|
||||
if z_repeated_step_count == None {
|
||||
let z_state = nbody.state("z");
|
||||
if z_states.contains(&z_state) {
|
||||
z_repeated_step_count = Some(step_count);
|
||||
} else {
|
||||
z_states.insert(z_state);
|
||||
}
|
||||
}
|
||||
|
||||
nbody.run_step();
|
||||
step_count += 1;
|
||||
}
|
||||
|
||||
Ok(lcm(
|
||||
x_repeated_step_count.unwrap(),
|
||||
lcm(
|
||||
y_repeated_step_count.unwrap(),
|
||||
z_repeated_step_count.unwrap(),
|
||||
),
|
||||
))
|
||||
}
|
||||
|
||||
fn main() -> Result<()> {
|
||||
println!("Part 1: {}", solve_part1(INPUT)?);
|
||||
println!("Part 2: {}", solve_part2(INPUT)?);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
const TEST_INPUT1: &str = "input/test1.txt";
|
||||
const TEST_INPUT2: &str = "input/test2.txt";
|
||||
fn nbody_1() -> NBody {
|
||||
NBody {
|
||||
bodies: vec![
|
||||
Body {
|
||||
position: Vector { x: -1, y: 0, z: 2 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector {
|
||||
x: 2,
|
||||
y: -10,
|
||||
z: -7,
|
||||
},
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 4, y: -8, z: 8 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 3, y: 5, z: -1 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
],
|
||||
}
|
||||
}
|
||||
fn nbody_1_after_10_steps() -> NBody {
|
||||
NBody {
|
||||
bodies: vec![
|
||||
Body {
|
||||
position: Vector { x: 2, y: 1, z: -3 },
|
||||
velocity: Vector { x: -3, y: -2, z: 1 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 1, y: -8, z: 0 },
|
||||
velocity: Vector { x: -1, y: 1, z: 3 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 3, y: -6, z: 1 },
|
||||
velocity: Vector { x: 3, y: 2, z: -3 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 2, y: 0, z: 4 },
|
||||
velocity: Vector { x: 1, y: -1, z: -1 },
|
||||
},
|
||||
],
|
||||
}
|
||||
}
|
||||
fn nbody_2() -> NBody {
|
||||
NBody {
|
||||
bodies: vec![
|
||||
Body {
|
||||
position: Vector {
|
||||
x: -8,
|
||||
y: -10,
|
||||
z: 0,
|
||||
},
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 5, y: 5, z: 10 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 2, y: -7, z: 3 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector { x: 9, y: -8, z: -3 },
|
||||
velocity: Vector { x: 0, y: 0, z: 0 },
|
||||
},
|
||||
],
|
||||
}
|
||||
}
|
||||
fn nbody_2_after_100_steps() -> NBody {
|
||||
NBody {
|
||||
bodies: vec![
|
||||
Body {
|
||||
position: Vector {
|
||||
x: 8,
|
||||
y: -12,
|
||||
z: -9,
|
||||
},
|
||||
velocity: Vector { x: -7, y: 3, z: 0 },
|
||||
},
|
||||
Body {
|
||||
position: Vector {
|
||||
x: 13,
|
||||
y: 16,
|
||||
z: -3,
|
||||
},
|
||||
velocity: Vector {
|
||||
x: 3,
|
||||
y: -11,
|
||||
z: -5,
|
||||
},
|
||||
},
|
||||
Body {
|
||||
position: Vector {
|
||||
x: -29,
|
||||
y: -11,
|
||||
z: -1,
|
||||
},
|
||||
velocity: Vector { x: -3, y: 7, z: 4 },
|
||||
},
|
||||
Body {
|
||||
position: Vector {
|
||||
x: 16,
|
||||
y: -13,
|
||||
z: 23,
|
||||
},
|
||||
velocity: Vector { x: 7, y: 1, z: 1 },
|
||||
},
|
||||
],
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn reads_moon_scan_file() {
|
||||
assert_eq!(read_moon_scan(TEST_INPUT1).unwrap(), nbody_1());
|
||||
assert_eq!(read_moon_scan(TEST_INPUT2).unwrap(), nbody_2());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn runs_10_steps() {
|
||||
let mut nbody = read_moon_scan(TEST_INPUT1).unwrap();
|
||||
for _ in 0..10 {
|
||||
nbody.run_step();
|
||||
}
|
||||
assert_eq!(nbody, nbody_1_after_10_steps());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn runs_100_steps() {
|
||||
let mut nbody = read_moon_scan(TEST_INPUT2).unwrap();
|
||||
for _ in 0..100 {
|
||||
nbody.run_step();
|
||||
}
|
||||
assert_eq!(nbody, nbody_2_after_100_steps());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn calculates_total_energy_after_10_steps() {
|
||||
let mut nbody = read_moon_scan(TEST_INPUT1).unwrap();
|
||||
for _ in 0..10 {
|
||||
nbody.run_step();
|
||||
}
|
||||
assert_eq!(nbody.total_energy(), 179);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn calculates_total_energy_after_100_steps() {
|
||||
let mut nbody = read_moon_scan(TEST_INPUT2).unwrap();
|
||||
for _ in 0..100 {
|
||||
nbody.run_step();
|
||||
}
|
||||
assert_eq!(nbody.total_energy(), 1940);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn finds_repeated_states() {
|
||||
assert_eq!(solve_part2(TEST_INPUT1).unwrap(), 2772);
|
||||
assert_eq!(solve_part2(TEST_INPUT2).unwrap(), 4686774924);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user