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Day 12

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This commit is contained in:
James Hogge
2025-12-17 03:14:19 +00:00
parent 654d1d666c
commit 8e31c24d4d
5 changed files with 1153 additions and 309 deletions
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1030
12-input.txt Normal file
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306
Cargo.lock generated
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@@ -5,309 +5,3 @@ version = 4
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7
Cargo.toml
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@@ -4,7 +4,6 @@ version = "0.1.0"
edition = "2024" edition = "2024"
[dependencies] [dependencies]
nalgebra = "0.34.1"
[[bin]] [[bin]]
name = "1-secret-entrance" name = "1-secret-entrance"
@@ -48,4 +47,8 @@ path = "src/10-factory.rs"
[[bin]] [[bin]]
name = "11-reactor" name = "11-reactor"
path = "src/11-reactor.rs" path = "src/11-reactor.rs"
[[bin]]
name = "12-christmas-tree-farm"
path = "src/12-christmas-tree-farm.rs"

1
src/10-factory.rs
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@@ -3,7 +3,6 @@ use std::fs::File;
use std::io::{self, BufRead, BufReader}; use std::io::{self, BufRead, BufReader};
use std::str::FromStr; use std::str::FromStr;
use std::u64; use std::u64;
use nalgebra::{DMatrix, DVector};
#[derive(Debug)] #[derive(Debug)]
struct Machine { struct Machine {

118
src/12-christmas-tree-farm.rs Normal file
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@@ -0,0 +1,118 @@
use std::{fs::File, io::{self, BufRead, BufReader}, str::FromStr};
struct Piece {
cells: Vec<Vec<bool>>
}
impl FromStr for Piece {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let cells: Vec<_> =
s.split('\n').map(|row| {
row.chars().fold(Vec::new(), |mut state, c| {
match c {
'#' => state.push(true),
'.' => state.push(false),
_ => ()
};
state
})
})
.collect();
Ok(Piece { cells: cells })
}
}
impl Piece {
fn bounds_area(&self) -> u64 {
let height = self.cells.len();
if height > 0 {
(self.cells[0].len() * height) as u64
} else {
0
}
}
fn true_area(&self) -> u64 {
self.cells.iter()
.flatten()
.map(|&b| if b { 1 } else { 0 })
.sum()
}
}
struct Region {
width: u64,
height: u64,
requirements: Vec<u64>
}
impl FromStr for Region {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (area_str, requirements_str) = s.split_once(':').unwrap();
let (width_str, height_str) = area_str.split_once('x').unwrap();
let width = width_str.parse::<u64>().unwrap();
let height = height_str.parse::<u64>().unwrap();
let requirements: Vec<_> = requirements_str.split(' ')
.fold(Vec::new(), |mut state, count| {
if let Ok(count) = count.parse::<u64>() {
state.push(count);
}
state
});
Ok(Region { width: width, height: height, requirements: requirements })
}
}
fn is_solveable(pieces: &[Piece], region: &Region) -> bool {
// Lower area bound = perfectly packed
let region_area = region.width * region.height;
let used_area: u64 = pieces.iter()
.zip(region.requirements.clone())
.map(|(piece, cnt)| piece.true_area() * cnt)
.sum();
if used_area > region_area { return false };
// Upper area bound = 3x3 pieces
let available_3x3s = region.width / 3 * region.height / 3;
let piece_cnt: u64 = region.requirements.iter().sum();
if piece_cnt <= available_3x3s { return true };
println!("Non-trivial solution");
false
}
fn main() -> Result<(), io::Error> {
let f = File::open("12-input.txt")?;
let reader = BufReader::new(f);
let lines: Vec<_> = reader.lines().collect::<Result<_,_>>()?;
let (lines_pieces, lines_regions) = lines.split_at(30);
let pieces: Vec<_> = lines_pieces.chunks(5)
.map(|lines| {
lines[1..lines.len()-1].join("\n").parse::<Piece>().unwrap()
})
.collect();
let regions: Vec<_> = lines_regions.iter()
.map(|line| {
line.parse::<Region>().unwrap()
})
.collect();
let result = regions.iter()
.map(|region| {
if is_solveable(&pieces, region) {
1
} else {
0
}
})
.sum::<u64>();
println!("Result: {}", result);
Ok(())
}