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[2017][rust][3.x]

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sorbet
Alpha Chen 7 years ago
parent e39e95e20a
commit fea6adcf63
6 changed files with 122 additions and 26 deletions
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7
2017/rust/Cargo.lock generated
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@ -3,6 +3,7 @@ name = "advent_of_code_2017"
version = "0.1.0"
dependencies = [
"failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -75,6 +76,11 @@ dependencies = [
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "lazy_static"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "libc"
version = "0.2.34"
@ -141,6 +147,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "934799b6c1de475a012a02dab0ace1ace43789ee4b99bcfbf1a2e3e8ced5de82"
"checksum failure_derive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c7cdda555bb90c9bb67a3b670a0f42de8e73f5981524123ad8578aafec8ddb8b"
"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
"checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
"checksum libc 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)" = "36fbc8a8929c632868295d0178dd8f63fc423fd7537ad0738372bd010b3ac9b0"
"checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
"checksum rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "aee45432acc62f7b9a108cc054142dac51f979e69e71ddce7d6fc7adf29e817e"

1
2017/rust/Cargo.toml
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@ -5,3 +5,4 @@ authors = ["Alpha Chen <alpha.chen@gmail.com>"]
[dependencies]
failure = "0.1"
lazy_static = "1.0"

16
2017/rust/src/day_01.rs
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@ -13,15 +13,13 @@ pub fn solve(input: &str) -> Result<String, Error> {
let offset = input.len() / 2;
let offset_iter = input.iter().cycle().skip(offset);
Ok(
input
.iter()
.zip(offset_iter)
.filter(|&a| a.0 == a.1)
.map(|a| a.0)
.sum::<u32>()
.to_string(),
)
Ok(input
.iter()
.zip(offset_iter)
.filter(|&a| a.0 == a.1)
.map(|a| a.0)
.sum::<u32>()
.to_string())
}
#[test]

31
2017/rust/src/day_02.rs
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@ -1,19 +1,18 @@
use failure::*;
#[allow(dead_code)]
pub fn solve(input: &str) -> Result<String, Error> {
Ok(
input
.trim()
.split('\n')
.map(|row| {
row.split('\t')
.map(|x| x.parse::<usize>().unwrap())
.collect::<Vec<_>>()
})
.map(|row| checksum(&row))
.sum::<usize>()
.to_string(),
)
Ok(input
.trim()
.split('\n')
.map(|row| {
row.split('\t')
.map(|x| x.parse::<usize>().unwrap())
.collect::<Vec<_>>()
})
.map(|row| checksum(&row))
.sum::<usize>()
.to_string())
}
fn checksum(row: &[usize]) -> usize {
@ -24,9 +23,9 @@ fn checksum(row: &[usize]) -> usize {
row.iter()
.flat_map(|x| row.iter().map(|y| (x, y)).collect::<Vec<_>>())
.filter(|&(a,b)| a != b)
.filter(|&(&a,&b)| (a as f64) % (b as f64) == 0.0)
.map(|(&a,&b)| a / b)
.filter(|&(a, b)| a != b)
.filter(|&(&a, &b)| (a as f64) % (b as f64) == 0.0)
.map(|(&a, &b)| a / b)
.next()
.unwrap()
}

86
2017/rust/src/day_03.rs
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@ -0,0 +1,86 @@
use std::collections::HashMap;
use std::iter;
use failure::*;
pub fn solve(input: &str) -> Result<String, Error> {
let input: usize = input.trim().parse()?;
// 1
// spiral()
// .zip(1..)
// .find(|&(_, i)| i == (square - 1))
// .map(|(coord, _)| (coord.0 + coord.1).to_string())
// .ok_or_else(|| format_err!(""))
// 2
let mut grid = HashMap::new();
grid.insert(Coord(0, 0), 1);
spiral()
.map(|coord| {
let sum = coord.neighbors().iter().filter_map(|x| grid.get(x)).sum();
grid.insert(coord, sum);
sum
})
.find(|value| value > &input)
.map(|value| value.to_string())
.ok_or_else(|| format_err!(""))
}
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
struct Coord(isize, isize);
impl Coord {
fn neighbors(&self) -> Vec<Coord> {
vec![
[-1, 1],
[0, 1],
[1, 1],
[-1, 0],
[1, 0],
[-1, -1],
[0, -1],
[1, -1],
].iter()
.map(|delta| Coord(self.0 + delta[0], self.1 + delta[1]))
.collect()
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
enum Dir {
Right,
Up,
Left,
Down,
}
lazy_static! {
static ref DIRS: Vec<Dir> = vec![Dir::Right, Dir::Up, Dir::Left, Dir::Down];
}
fn spiral() -> impl Iterator<Item = Coord> {
(1..)
.flat_map(|x| iter::repeat(x).take(2))
.zip(DIRS.iter().cycle())
.flat_map(|(steps, dir)| iter::repeat(dir).take(steps))
.scan(Coord(0, 0), |state, &dir| {
*state = match dir {
Dir::Right => Coord(state.0 + 1, state.1),
Dir::Up => Coord(state.0, state.1 + 1),
Dir::Left => Coord(state.0 - 1, state.1),
Dir::Down => Coord(state.0, state.1 - 1),
};
Some(*state)
})
}
#[test]
fn test_coords() {
let mut spiral = spiral();
assert_eq!(spiral.next(), Some(Coord(1, 0)));
assert_eq!(spiral.next(), Some(Coord(1, 1)));
assert_eq!(spiral.next(), Some(Coord(0, 1)));
assert_eq!(spiral.next(), Some(Coord(-1, 1)));
assert_eq!(spiral.next(), Some(Coord(-1, 0)));
assert_eq!(spiral.next(), Some(Coord(-1, -1)));
}

7
2017/rust/src/main.rs
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@ -1,4 +1,8 @@
#![feature(conservative_impl_trait)]
extern crate failure;
#[macro_use]
extern crate lazy_static;
use std::io::{self, Read};
@ -6,6 +10,7 @@ use failure::Error;
mod day_01;
mod day_02;
mod day_03;
fn main() {
if let Err(e) = run() {
@ -17,7 +22,7 @@ fn run() -> Result<(), Error> {
let mut input = String::new();
io::stdin().read_to_string(&mut input)?;
let solution = day_02::solve(&input)?;
let solution = day_03::solve(&input)?;
println!("{}", solution);
Ok(())

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