Complete day 11.1
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GPG key ID:
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day-11/Cargo.lock
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day-11/Cargo.lock
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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 = "day-11"
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version = "0.1.0"
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dependencies = [
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"indoc",
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]
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[[package]]
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name = "indoc"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
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dependencies = [
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"indoc-impl",
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"proc-macro-hack",
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]
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[[package]]
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name = "indoc-impl"
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version = "0.3.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
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dependencies = [
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"proc-macro-hack",
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"proc-macro2",
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"quote",
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"syn",
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"unindent",
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]
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[[package]]
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name = "proc-macro-hack"
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version = "0.5.19"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
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[[package]]
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name = "proc-macro2"
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version = "1.0.24"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "syn"
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version = "1.0.54"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
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[[package]]
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name = "unindent"
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version = "0.1.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"
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10
day-11/Cargo.toml
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day-11/Cargo.toml
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[package]
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name = "day-11"
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version = "0.1.0"
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authors = ["Tristan Daniël Maat <tm@tlater.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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indoc = "0.3"
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day-11/input
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LLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLL.LLLLLL.L.LLLLLL.LLLL.LLLLLLLL
|
||||||
|
LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLL..LLLLLLLLLLLL.LLLLLLLL
|
||||||
|
LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL
|
||||||
|
LLLLLLLLLL.LLLLLLLLL.LL.LLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL
|
||||||
180
day-11/src/main.rs
Normal file
180
day-11/src/main.rs
Normal file
|
|
@ -0,0 +1,180 @@
|
||||||
|
use std::fs;
|
||||||
|
|
||||||
|
fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||||
|
let input = fs::read_to_string("input")?;
|
||||||
|
let layout = parse_layout(&input)?;
|
||||||
|
|
||||||
|
// Part 1
|
||||||
|
let result = count_eventually_occupied_seats(&layout);
|
||||||
|
println!("{}", result);
|
||||||
|
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Copy, Clone, Debug, PartialEq)]
|
||||||
|
enum Seating {
|
||||||
|
Occupied,
|
||||||
|
Empty,
|
||||||
|
Floor,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Seating {
|
||||||
|
fn new(symbol: char) -> Result<Self, String> {
|
||||||
|
match symbol {
|
||||||
|
'#' => Ok(Seating::Occupied),
|
||||||
|
'L' => Ok(Seating::Empty),
|
||||||
|
'.' => Ok(Seating::Floor),
|
||||||
|
rubbish => Err(format!("Found some rubbish on the floor, area must be clean to conserve human behavior: {}", rubbish))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn parse_layout(input: &str) -> Result<Vec<Vec<Seating>>, String> {
|
||||||
|
input
|
||||||
|
.lines()
|
||||||
|
.map(|line| line.chars().map(Seating::new).collect())
|
||||||
|
.collect()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn print_layout(layout: &Vec<Vec<Seating>>) {
|
||||||
|
let output: String = layout
|
||||||
|
.iter()
|
||||||
|
.map(|row| {
|
||||||
|
let mut row: String = row
|
||||||
|
.iter()
|
||||||
|
.map(|c| match c {
|
||||||
|
Seating::Occupied => '#',
|
||||||
|
Seating::Empty => 'L',
|
||||||
|
Seating::Floor => '.',
|
||||||
|
})
|
||||||
|
.collect();
|
||||||
|
row.push('\n');
|
||||||
|
row
|
||||||
|
})
|
||||||
|
.collect();
|
||||||
|
|
||||||
|
println!("{}", output);
|
||||||
|
}
|
||||||
|
|
||||||
|
fn get_adjacent(layout: &Vec<Vec<Seating>>, i: usize, j: usize) -> Vec<Option<&Seating>> {
|
||||||
|
let adjacent: [[usize; 2]; 8] = [
|
||||||
|
[0, 0],
|
||||||
|
[0, 1],
|
||||||
|
[0, 2],
|
||||||
|
[1, 0],
|
||||||
|
[1, 2],
|
||||||
|
[2, 0],
|
||||||
|
[2, 1],
|
||||||
|
[2, 2],
|
||||||
|
];
|
||||||
|
|
||||||
|
adjacent
|
||||||
|
.iter()
|
||||||
|
.map(|[nudge_row, nudge_col]| {
|
||||||
|
if let Some(row) = (i + nudge_row).checked_sub(1) {
|
||||||
|
if let Some(row) = layout.get(row) {
|
||||||
|
if let Some(col) = (j + nudge_col).checked_sub(1) {
|
||||||
|
row.get(col)
|
||||||
|
} else {
|
||||||
|
None
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
None
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
None
|
||||||
|
}
|
||||||
|
})
|
||||||
|
.collect()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn simulate_people(layout: &Vec<Vec<Seating>>) -> (Vec<Vec<Seating>>, usize) {
|
||||||
|
let mut changes = 0;
|
||||||
|
|
||||||
|
let layout = layout
|
||||||
|
.iter()
|
||||||
|
.enumerate()
|
||||||
|
.map(|(i, row)| {
|
||||||
|
row.iter()
|
||||||
|
.enumerate()
|
||||||
|
.map(|(j, seat)| match seat {
|
||||||
|
Seating::Occupied => {
|
||||||
|
if get_adjacent(layout, i, j)
|
||||||
|
.iter()
|
||||||
|
.filter(|seat| **seat == Some(&Seating::Occupied))
|
||||||
|
.count()
|
||||||
|
>= 4
|
||||||
|
{
|
||||||
|
changes += 1;
|
||||||
|
Seating::Empty
|
||||||
|
} else {
|
||||||
|
Seating::Occupied
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Seating::Empty => {
|
||||||
|
if get_adjacent(layout, i, j)
|
||||||
|
.iter()
|
||||||
|
.any(|seat| *seat == Some(&Seating::Occupied))
|
||||||
|
{
|
||||||
|
Seating::Empty
|
||||||
|
} else {
|
||||||
|
changes += 1;
|
||||||
|
Seating::Occupied
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Seating::Floor => Seating::Floor,
|
||||||
|
})
|
||||||
|
.collect()
|
||||||
|
})
|
||||||
|
.collect();
|
||||||
|
|
||||||
|
(layout, changes)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn count_eventually_occupied_seats(layout: &Vec<Vec<Seating>>) -> usize {
|
||||||
|
let mut loop_layout = layout.clone();
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let (res, changes) = simulate_people(&loop_layout);
|
||||||
|
loop_layout = res;
|
||||||
|
|
||||||
|
if changes == 0 {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
loop_layout
|
||||||
|
.iter()
|
||||||
|
.flatten()
|
||||||
|
.filter(|seat| **seat == Seating::Occupied)
|
||||||
|
.count()
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
use indoc::indoc;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
|
||||||
|
let input = indoc!(
|
||||||
|
"L.LL.LL.LL
|
||||||
|
LLLLLLL.LL
|
||||||
|
L.L.L..L..
|
||||||
|
LLLL.LL.LL
|
||||||
|
L.LL.LL.LL
|
||||||
|
L.LLLLL.LL
|
||||||
|
..L.L.....
|
||||||
|
LLLLLLLLLL
|
||||||
|
L.LLLLLL.L
|
||||||
|
L.LLLLL.LL
|
||||||
|
"
|
||||||
|
);
|
||||||
|
|
||||||
|
let layout = parse_layout(&input)?;
|
||||||
|
let result = count_eventually_occupied_seats(&layout);
|
||||||
|
|
||||||
|
assert_eq!(result, 37);
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue