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4 commits
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Author SHA1 Message Date
Tristan Daniël Maat 6dd5d1a04c
Complete day 11.1 2020-12-12 20:41:49 +00:00
Tristan Daniël Maat 7b7e983e9a
Complete day 12.2 2020-12-12 20:40:23 +00:00
Tristan Daniël Maat c0a6391e85
Complete day 12.1 2020-12-12 20:40:20 +00:00
Tristan Daniël Maat 0355eeccb4
Add global ignore for target/ directories 
This is just the rust compilation directory, I kept locally ignoring
it in sub-projects...
 2020-12-12 20:40:17 +00:00
9 changed files with 1446 additions and 0 deletions
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.gitignore vendored Normal file
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target/

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day-11/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "day-11"
version = "0.1.0"
dependencies = [
"indoc",
]
[[package]]
name = "indoc"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
dependencies = [
"indoc-impl",
"proc-macro-hack",
]
[[package]]
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dependencies = [
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"proc-macro2",
"quote",
"syn",
"unindent",
]
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dependencies = [
"unicode-xid",
]
[[package]]
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version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
dependencies = [
"proc-macro2",
]
[[package]]
name = "syn"
version = "1.0.54"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
dependencies = [
"proc-macro2",
"quote",
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checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
[[package]]
name = "unindent"
version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

10
day-11/Cargo.toml Normal file
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[package]
name = "day-11"
version = "0.1.0"
authors = ["Tristan Daniël Maat <tm@tlater.net>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
indoc = "0.3"

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LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL
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LLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLLLL.LL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLL.L.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
..L...L.L..L.LL.....L.L..L...L.L.....L.L...LLL..L....L.L.LL.LL...L.....LLL.....L...L..L..L.......
LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLL.L.LLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLL..LLLLLLLLLLLLLLLLLLLLLL
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..L.L.LL.L..LL..L..LL.L..L................L....L............L.L..L...L...L..LLLL....L.L..LL....L.
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LLLLLLLLLL.LLLL.LLLL.L.LLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLL
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LLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLL.LLL
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.LLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLL.L.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL
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..L....LL..LL.LLLL......L..L...LLL.L......L.L.....L....L....LLLL.....L..LL...L....L....LLL....LL.
LLLLLLLLLLLLLLL.LLLL.LLLLL.LLLLLLLL..LLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL..LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL..LLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LL
LLLLLLLLLLLLLLL.LLL..LLLLLLLL.LL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLL
...LL.LL.....LL..LLL.....LL....LL....L.LL.L.LL....L........LLLL..LLLLLL.L..L..LLL......L....L....
LLL.LLLLLLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LL.LLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLL
.....L.L..LL..LL..L.L.L.....LLLLL.....L..L...L.....L.L..L..L....LL....L...........L.L.......L.LLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLL
LLL.LLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL..LLLLLLL.LLLLLLLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLL.L.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL
LLLL.L.LLL.LLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLLLLL.LL.L.LLLLLLLL
L.LLL.................LLL....L...LL..........L.L.L.......L.....L.....LLLLLL......L.......L...L.LL
LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLLLLLLL.LLL..LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLL.LLL..LLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL
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LLLLLLLLLL.LLLLLLLLL.LLL.LLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLL.LLLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLL.LL.LLLLLLLL
LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLL.LLLLL.LLLLL.LLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LL.LL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL
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LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
..L.L.....L......L..L.....L.......L..L....LL...L.L.L...LLL.L.L..L..L..L......LLL.....L..L..L.....
LLLLLLLLLLLLLLL.LLLLLL.LLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL
LLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL
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

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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(())
}
}

78
day-12/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "day-12"
version = "0.1.0"
dependencies = [
"indoc",
]
[[package]]
name = "indoc"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
dependencies = [
"indoc-impl",
"proc-macro-hack",
]
[[package]]
name = "indoc-impl"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
dependencies = [
"proc-macro-hack",
"proc-macro2",
"quote",
"syn",
"unindent",
]
[[package]]
name = "proc-macro-hack"
version = "0.5.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
[[package]]
name = "proc-macro2"
version = "1.0.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
dependencies = [
"unicode-xid",
]
[[package]]
name = "quote"
version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
dependencies = [
"proc-macro2",
]
[[package]]
name = "syn"
version = "1.0.54"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
dependencies = [
"proc-macro2",
"quote",
"unicode-xid",
]
[[package]]
name = "unicode-xid"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
[[package]]
name = "unindent"
version = "0.1.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"

10
day-12/Cargo.toml Normal file
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[package]
name = "day-12"
version = "0.1.0"
authors = ["Tristan Daniël Maat <tm@tlater.net>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
indoc = "0.3"

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N4
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N5
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N5
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F34
S2
E5
N5
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F53
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E5
F59
E1
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W4
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N2
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W1
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N4
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E3
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W1
N3
S2
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E5
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N1
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L90
N1
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E3
S1
W3
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S1
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E5
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S3
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N4
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S4
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N3
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W4
S5
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S3
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E2
F1
W1
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W3
S3
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W2
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S2
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F56
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S5
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W2
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W4
F85
E3
N3
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F31
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F20
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N5
E3
S4
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N5
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E3
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E3
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N4
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F22
E5
L90
F79
W1
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F41
R180
F54

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use std::fs;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let input = fs::read_to_string("input")?;
let actions = parse_actions(&input)?;
// Part 1
let location = simulate_ship_movement(&actions);
println!("{}", location.0.abs() + location.1.abs());
// Part 2
let location = simulate_waypoint_movement(&actions);
println!("{}", location.0.abs() + location.1.abs());
Ok(())
}
#[derive(Copy, Clone, Debug)]
enum Action {
North(u32),
South(u32),
East(u32),
West(u32),
Left(u32),
Right(u32),
Forward(u32),
}
impl Action {
fn new(input: &str) -> Result<Self, String> {
if input.len() < 2 {
Err(format!("Invalud input line: {}", input))?;
}
let (action, value) = input.split_at(1);
let value = value
.parse()
.map_err(|e| format!("Could not parse value: {}", e))?;
Ok(match action {
"N" => Self::North(value),
"S" => Self::South(value),
"E" => Self::East(value),
"W" => Self::West(value),
"L" => Self::Left(value),
"R" => Self::Right(value),
"F" => Self::Forward(value),
_ => Err(format!("Could not parse action: {}", action))?,
})
}
fn opposite_direction(self) -> Self {
match self {
Action::North(x) => Action::South(x),
Action::South(x) => Action::North(x),
Action::East(x) => Action::West(x),
Action::West(x) => Action::East(x),
_ => panic!("Invalid direction"),
}
}
fn right_direction(self) -> Self {
match self {
Action::North(x) => Action::East(x),
Action::South(x) => Action::West(x),
Action::East(x) => Action::South(x),
Action::West(x) => Action::North(x),
_ => panic!("Invalid direction"),
}
}
fn left_direction(self) -> Self {
match self {
Action::North(x) => Action::West(x),
Action::South(x) => Action::East(x),
Action::East(x) => Action::North(x),
Action::West(x) => Action::South(x),
_ => panic!("Invalid direction"),
}
}
}
fn parse_actions(input: &str) -> Result<Vec<Action>, String> {
input.lines().map(Action::new).collect()
}
fn simulate_ship_movement(actions: &Vec<Action>) -> (i64, i64) {
let mut coords: (i64, i64) = (0, 0);
let mut direction = Action::East(0);
for action in actions {
// If the action is Action::Forward, we instead want to move
// in a direction determined by our current angle.
//
// So we convert Action::Forward to a concrete direction.
let converted_action = if let &Action::Forward(amount) = action {
match direction {
Action::North(_) => Action::North(amount),
Action::South(_) => Action::South(amount),
Action::East(_) => Action::East(amount),
Action::West(_) => Action::West(amount),
_ => unreachable!("Direction can only be NSEW."),
}
} else {
*action
};
match converted_action {
Action::North(amount) => {
coords.1 += amount as i64;
}
Action::South(amount) => {
coords.1 -= amount as i64;
}
Action::East(amount) => {
coords.0 += amount as i64;
}
Action::West(amount) => {
coords.0 -= amount as i64;
}
Action::Left(amount) => match amount % 360 {
0 => direction = direction,
90 => direction = direction.left_direction(),
180 => direction = direction.opposite_direction(),
270 => direction = direction.right_direction(),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Right(amount) => match amount % 360 {
0 => direction = direction,
90 => direction = direction.right_direction(),
180 => direction = direction.opposite_direction(),
270 => direction = direction.left_direction(),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Forward(_) => unreachable!("Converted previously"),
}
}
coords
}
fn simulate_waypoint_movement(actions: &Vec<Action>) -> (i64, i64) {
let mut waypoint = (1, 10);
let mut ship = (0, 0);
for action in actions {
match *action {
Action::North(amount) => {
waypoint.0 += amount as i64;
}
Action::South(amount) => {
waypoint.0 -= amount as i64;
}
Action::East(amount) => {
waypoint.1 += amount as i64;
}
Action::West(amount) => {
waypoint.1 -= amount as i64;
}
Action::Left(amount) => match amount % 360 {
0 => {}
90 => waypoint = (waypoint.1, -waypoint.0),
180 => waypoint = (-waypoint.0, -waypoint.1),
270 => waypoint = (-waypoint.1, waypoint.0),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Right(amount) => match amount % 360 {
0 => {}
90 => waypoint = (-waypoint.1, waypoint.0),
180 => waypoint = (-waypoint.0, -waypoint.1),
270 => waypoint = (waypoint.1, -waypoint.0),
_ => panic!("Only 90 degree turns allowed"),
},
Action::Forward(amount) => {
ship.0 += waypoint.0 * amount as i64;
ship.1 += waypoint.1 * amount as i64;
}
}
}
ship
}
#[cfg(test)]
mod tests {
use super::*;
use indoc::indoc;
#[test]
fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
let input = indoc!(
"F10
N3
F7
R90
F11
"
);
let actions = parse_actions(&input)?;
let location = simulate_ship_movement(&actions);
assert_eq!(location.0.abs() + location.1.abs(), 25);
Ok(())
}
#[test]
fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
let input = indoc!(
"F10
N3
F7
R90
F11
"
);
let actions = parse_actions(&input)?;
let location = simulate_waypoint_movement(&actions);
assert_eq!(location.0.abs() + location.1.abs(), 286);
Ok(())
}
}