day14: problem 1 solution
This commit is contained in:
parent
5666aee5f2
commit
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GPG Key ID:
11230674D69038D4
92
14/Cargo.lock
generated
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92
14/Cargo.lock
generated
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@ -0,0 +1,92 @@
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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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version = 3
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[[package]]
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name = "autocfg"
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version = "1.1.0"
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checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
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[[package]]
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name = "day14"
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version = "0.1.0"
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dependencies = [
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"num",
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]
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[[package]]
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name = "num"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-bigint",
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"num-complex",
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"num-integer",
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"num-iter",
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"num-rational",
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"num-traits",
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]
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[[package]]
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checksum = "1ba157ca0885411de85d6ca030ba7e2a83a28636056c7c699b07c8b6f7383214"
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dependencies = [
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"num-traits",
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[[package]]
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name = "num-integer"
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version = "0.1.45"
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checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
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dependencies = [
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"autocfg",
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"num-traits",
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]
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[[package]]
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name = "num-iter"
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version = "0.1.43"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7d03e6c028c5dc5cac6e2dec0efda81fc887605bb3d884578bb6d6bf7514e252"
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dependencies = [
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"autocfg",
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"num-integer",
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"num-traits",
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[[package]]
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name = "num-rational"
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version = "0.4.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
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dependencies = [
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"autocfg",
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"num-bigint",
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"num-integer",
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"num-traits",
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]
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[[package]]
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name = "num-traits"
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version = "0.2.17"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
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dependencies = [
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"autocfg",
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]
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9
14/Cargo.toml
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9
14/Cargo.toml
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@ -0,0 +1,9 @@
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[package]
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name = "day14"
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version = "0.1.0"
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edition = "2021"
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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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num = "0.4.1"
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100
14/input
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100
14/input
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184
14/src/main.rs
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184
14/src/main.rs
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use std::fmt::{Display, Write};
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use std::fs::File;
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use std::io::{BufRead, BufReader, Lines};
|
||||
use std::time::{Duration, Instant};
|
||||
|
||||
// BOILERPLATE
|
||||
type InputIter = Lines<BufReader<File>>;
|
||||
|
||||
fn get_input() -> InputIter {
|
||||
let f = File::open("input").unwrap();
|
||||
let br = BufReader::new(f);
|
||||
br.lines()
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let start = Instant::now();
|
||||
let ans1 = problem1(get_input());
|
||||
let duration = start.elapsed();
|
||||
println!("Problem 1 solution: {} [{}s]", ans1, duration.as_secs_f64());
|
||||
|
||||
let start = Instant::now();
|
||||
let ans2 = problem2(get_input());
|
||||
let duration = start.elapsed();
|
||||
println!("Problem 2 solution: {} [{}s]", ans2, duration.as_secs_f64());
|
||||
}
|
||||
|
||||
// PARSE
|
||||
|
||||
struct Platform(Vec<Vec<char>>);
|
||||
|
||||
impl<T: BufRead> From<Lines<T>> for Platform {
|
||||
fn from(lines: Lines<T>) -> Self {
|
||||
Self(lines.map(|line| line.unwrap().chars().collect()).collect())
|
||||
}
|
||||
}
|
||||
|
||||
enum Direction {
|
||||
North,
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
enum Axis {
|
||||
Rows,
|
||||
Columns,
|
||||
}
|
||||
|
||||
impl Direction {
|
||||
fn reverse_direction(&self) -> bool {
|
||||
match self {
|
||||
Direction::North => false,
|
||||
}
|
||||
}
|
||||
fn axis(&self) -> Axis {
|
||||
match self {
|
||||
Direction::North => Axis::Columns,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Platform {
|
||||
fn width(&self) -> usize {
|
||||
self.0[0].len()
|
||||
}
|
||||
fn col(&self, col: usize) -> Vec<char> {
|
||||
self.0.iter().map(|row| row[col]).collect()
|
||||
}
|
||||
fn replace_col(&mut self, idx: usize, col: Vec<char>) {
|
||||
for row_idx in 0..col.len() {
|
||||
self.0[row_idx][idx] = col[row_idx];
|
||||
}
|
||||
}
|
||||
fn roll(&mut self, dir: &Direction) {
|
||||
match dir.axis() {
|
||||
Axis::Columns => self.roll_columns(&dir),
|
||||
Axis::Rows => self.roll_rows(&dir),
|
||||
}
|
||||
}
|
||||
fn score(&self, dir: &Direction) -> u64 {
|
||||
match dir.axis() {
|
||||
Axis::Columns => self.score_columns(dir),
|
||||
Axis::Rows => self.score_rows(dir),
|
||||
}
|
||||
}
|
||||
fn roll_columns(&mut self, dir: &Direction) {
|
||||
assert_eq!(dir.axis(), Axis::Columns);
|
||||
|
||||
for col in 0..self.width() {
|
||||
self.roll_column(col, dir);
|
||||
}
|
||||
}
|
||||
fn roll_column(&mut self, idx: usize, dir: &Direction) {
|
||||
let mut col = self.col(idx);
|
||||
// TODO: implement reverse direction
|
||||
for col_idx in 0..col.len() {
|
||||
match col[col_idx] {
|
||||
'.' | '#' => continue,
|
||||
'O' if col_idx == 0 => continue,
|
||||
'O' => {
|
||||
// Find the first # rock or the edge of the map, we can't look beyond this for a resting position
|
||||
let lower_limit = (0..col_idx).rev().find(|c| col[*c] == '#').unwrap_or(0);
|
||||
|
||||
if let Some(empty_pos) = (lower_limit..col_idx)
|
||||
.rev()
|
||||
.filter(|i| col[*i] == '.')
|
||||
.last()
|
||||
{
|
||||
col.swap(col_idx, empty_pos);
|
||||
}
|
||||
}
|
||||
_ => panic!("invalid character"),
|
||||
}
|
||||
}
|
||||
self.replace_col(idx, col);
|
||||
}
|
||||
fn score_columns(&self, dir: &Direction) -> u64 {
|
||||
// TODO: implement reverse direction
|
||||
(0..self.0.len())
|
||||
.map(|row| {
|
||||
let row_score = self.0.len() - row;
|
||||
self.0[row].iter().filter(|c| **c == 'O').count() * row_score
|
||||
})
|
||||
.sum::<usize>() as u64
|
||||
}
|
||||
fn roll_rows(&self, dir: &Direction) {
|
||||
unimplemented!()
|
||||
}
|
||||
fn score_rows(&self, dir: &Direction) -> u64 {
|
||||
unimplemented!()
|
||||
}
|
||||
}
|
||||
|
||||
impl Display for Platform {
|
||||
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
||||
for row in &self.0 {
|
||||
for c in row {
|
||||
f.write_char(*c)?;
|
||||
}
|
||||
writeln!(f)?;
|
||||
}
|
||||
writeln!(f)
|
||||
}
|
||||
}
|
||||
|
||||
// PROBLEM 1 solution
|
||||
|
||||
fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
|
||||
let mut p = Platform::from(input);
|
||||
p.roll(&Direction::North);
|
||||
p.score(&Direction::North)
|
||||
}
|
||||
|
||||
// PROBLEM 2 solution
|
||||
fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
|
||||
0
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use crate::*;
|
||||
use std::io::Cursor;
|
||||
|
||||
const EXAMPLE: &str = &"O....#....
|
||||
O.OO#....#
|
||||
.....##...
|
||||
OO.#O....O
|
||||
.O.....O#.
|
||||
O.#..O.#.#
|
||||
..O..#O..O
|
||||
.......O..
|
||||
#....###..
|
||||
#OO..#....";
|
||||
|
||||
#[test]
|
||||
fn problem1_example() {
|
||||
let c = Cursor::new(EXAMPLE);
|
||||
assert_eq!(problem1(c.lines()), 136);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn problem2_example() {
|
||||
let c = Cursor::new(EXAMPLE);
|
||||
assert_eq!(problem2(c.lines()), 0);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user