Sejsel
/
33-3-4
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
Browse Source

Split into multiple modules

master
Jirka Sejkora 4 years ago
parent
5ee3f236be
commit
28567a0b3f
6 changed files with 556 additions and 620 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 4
      Cargo.toml
  2. 250
      src/city.rs
  3. 55
      src/find_useless.rs
  4. 582
      src/main.rs
  5. 264
      src/optimization.rs
  6. 21
      src/population.rs

4
Cargo.toml
View File

@ -14,7 +14,3 @@ indicatif = "0.15.0"
[[bin]]
name = "prague"
path = "src/main.rs"
[[bin]]
name = "find-useless"
path = "src/find_useless.rs"

250
src/city.rs
View File

@ -0,0 +1,250 @@
use std::fmt;
use std::fmt::Formatter;
pub const SIZE: usize = 16384;
pub const HOUSE_RANGE: usize = 500;
pub struct City {
prices: Vec<u16>,
buyable_house_count: usize
}
impl City {
pub fn read_from_file(filename: &str) -> Self {
let values = std::fs::read(filename).unwrap();
let mut prices: Vec<u16> = Vec::new();
for y in 0..SIZE {
for x in 0..SIZE {
let price = (values[(y * SIZE + x) * 2] as u16) | ((values[(y * SIZE + x) * 2 + 1] as u16) << 8);
prices.push(price);
}
}
City::new(prices)
}
pub fn new(prices: Vec<u16>) -> Self {
let mut buyable_house_count = 0;
for &price in &prices {
if price > 0 {
buyable_house_count += 1;
}
}
City { prices, buyable_house_count }
}
pub fn get_price(&self, house: &House) -> u16 {
self.prices[house.y * SIZE + house.x]
}
pub fn get_price_xy(&self, x: usize, y: usize) -> u16 {
self.prices[y * SIZE + x]
}
pub fn is_house(&self, house: &House) -> bool {
self.get_price(&house) > 0
}
pub fn is_house_xy(&self, x: usize, y: usize) -> bool {
self.get_price_xy(x, y) > 0
}
pub fn get_house_count(&self) -> usize {
self.buyable_house_count
}
}
#[derive(Eq, PartialEq, Hash, Copy, Clone)]
pub struct House {
pub x: usize,
pub y: usize,
}
impl House {
pub fn new(x: usize, y: usize) -> Self {
House { x, y }
}
pub fn range_rectangle(&self) -> Rectangle {
let top = if self.y <= HOUSE_RANGE { 0 } else { self.y - HOUSE_RANGE };
let bottom = if self.y >= SIZE - 1 - HOUSE_RANGE { SIZE - 1 } else { self.y + HOUSE_RANGE };
let left = if self.x <= HOUSE_RANGE { 0 } else { self.x - HOUSE_RANGE };
let right = if self.x >= SIZE - 1 - HOUSE_RANGE { SIZE - 1 } else { self.x + HOUSE_RANGE };
Rectangle {top, bottom, left, right}
}
}
/// Rectangle - a 2D range with inclusive bounds
pub struct Rectangle {
/// The smaller x coordinate.
pub left: usize,
/// The bigger x coordinate.
pub right: usize,
/// The smaller y coordinate.
pub top: usize,
/// The bigger y coordinate.
pub bottom: usize,
}
impl fmt::Display for Rectangle {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "L{}-{}R T{}-{}B", self.left, self.right, self.top, self.bottom)
}
}
impl Rectangle {
pub fn is_inside(&self, x: usize, y: usize) -> bool {
self.left <= x && x <= self.right && self.top <= y && y <= self.bottom
}
pub fn width(&self) -> usize {
self.right - self.left
}
pub fn height(&self) -> usize {
self.bottom - self.top
}
}
pub struct HouseLayout<'a> {
pub city: &'a City,
reachable: Vec<u16>,
houses: Vec<House>,
reachable_houses: usize
}
impl<'a> HouseLayout<'a> {
pub fn new(city: &'a City) -> Self {
HouseLayout { city, reachable: vec![0; SIZE * SIZE], houses: Vec::new(), reachable_houses: 0 }
}
pub fn cover_count(&self, house: House) -> u16 {
self.reachable[house.y * SIZE + house.x]
}
pub fn cover_count_xy(&self, x: usize, y: usize) -> u16 {
self.reachable[y * SIZE + x]
}
pub fn is_covered(&self, house: House) -> bool {
self.cover_count(house) > 0
}
pub fn add_house(&mut self, house: House) -> usize {
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
let index = y as usize * SIZE + x as usize;
if self.reachable[index] == 0 && self.city.is_house_xy(x as usize, y as usize) {
self.reachable_houses += 1;
}
self.reachable[index] += 1;
}
}
self.houses.push(house);
self.houses.len() - 1
}
pub fn remove_house(&mut self, index: usize) {
let house = self.houses.swap_remove(index);
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
let index = y as usize * SIZE + x as usize;
self.reachable[index] -= 1;
if self.reachable[index] == 0 && self.city.is_house_xy(x as usize, y as usize) {
self.reachable_houses -= 1;
}
}
}
}
pub fn is_valid(&self) -> bool {
self.reachable_houses == self.city.buyable_house_count
}
pub fn price(&self) -> u32 {
get_price(self.city, &self.houses)
}
pub fn houses(&self) -> &Vec<House> {
&self.houses
}
}
fn get_price(city: &City, houses: &Vec<House>) -> u32 {
let mut price = 0u32;
for house in houses {
price += city.get_price(&house) as u32;
}
price
}
fn is_valid(city: &City, houses: &Vec<House>) -> Option<u32> {
let mut reachable = vec![false; SIZE * SIZE];
let mut price = 0u32;
for house in houses {
assert!(city.prices[house.y * SIZE + house.x] > 0);
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
reachable[y as usize * SIZE + x as usize] = true;
}
}
price += city.get_price(&house) as u32;
}
for y in 0..SIZE {
for x in 0..SIZE {
if !reachable[y * SIZE + x] && city.prices[y * SIZE + x] > 0 {
return None;
}
}
}
Some(price)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn house_rectangle_at_min() {
let house = House::new(0, 0);
let rect = house.range_rectangle();
assert_eq!(rect.top, 0);
assert_eq!(rect.left, 0);
assert_eq!(rect.right, HOUSE_RANGE);
assert_eq!(rect.bottom, HOUSE_RANGE);
}
#[test]
fn house_rectangle_at_max() {
let house = House::new(SIZE - 1, SIZE - 1);
let rect = house.range_rectangle();
assert_eq!(rect.top, SIZE - 1 - HOUSE_RANGE);
assert_eq!(rect.left, SIZE - 1 - HOUSE_RANGE);
assert_eq!(rect.right, SIZE - 1);
assert_eq!(rect.bottom, SIZE - 1);
}
#[test]
fn house_rect_in_middle() {
let house = House::new(SIZE / 2, SIZE / 2);
let rect = house.range_rectangle();
assert_eq!(rect.top, house.y - HOUSE_RANGE);
assert_eq!(rect.left, house.x - HOUSE_RANGE);
assert_eq!(rect.right, house.x + HOUSE_RANGE);
assert_eq!(rect.bottom, house.y + HOUSE_RANGE);
}
}

55
src/find_useless.rs
View File

@ -1,55 +0,0 @@
use indicatif::{ProgressBar, ProgressStyle};
use std::collections::HashSet;
use main::{get_neighbors, House, City};
mod main;
fn main() {
// This is quite frankly useless
let city = City::read_from_file("01.in");
let bar = ProgressBar::new(city.get_house_count() as u64);
bar.set_style(ProgressStyle::default_bar()
.template("{spinner:.green} [{elapsed_precise}] [{bar:40.cyan/blue}] {pos}/{len} ({msg}) ({eta})")
.progress_chars("#>-"));
let mut useless_count = 0;
let mut checked_count = 0;
for y in 0..main::SIZE {
for x in 0..main::SIZE {
if city.is_house_xy(x, y) {
let house = House::new(x, y);
let house_neighbors = get_neighbors(&city, &house);
let mut useless = true;
for neighbor in &house_neighbors {
if city.get_price(&house) < city.get_price(&neighbor) {
useless = false;
break;
}
let neighbor_neighbors: HashSet<_> = get_neighbors(&city, &neighbor).into_iter().collect();
// Check if house_neighbors is a subset of neighbor_neighbors
let all_in = &house_neighbors.iter().all(|item| neighbor_neighbors.contains(item));
if !all_in {
useless = false;
break;
}
}
if useless {
println!("{} {}", y, x);
useless_count += 1;
} else {
//println!("Y{} X{} may be sometimes worth buying", y, x);
}
checked_count += 1;
bar.set_message(&*format!("{}, {:.2}%", useless_count, 100.0 * useless_count as f64/checked_count as f64));
bar.inc(1);
}
}
}
bar.finish();
}

582
src/main.rs
View File

@ -3,201 +3,11 @@ use rand::{SeedableRng, Rng, thread_rng};
use std::fmt;
use std::fmt::Formatter;
use std::collections::{HashMap, HashSet};
use city::{HouseLayout, City, House};
pub const SIZE: usize = 16384;
pub const HOUSE_RANGE: usize = 500;
pub struct City {
prices: Vec<u16>,
buyable_house_count: usize
}
impl City {
pub fn read_from_file(filename: &str) -> Self {
let values = std::fs::read(filename).unwrap();
let mut prices: Vec<u16> = Vec::new();
for y in 0..SIZE {
for x in 0..SIZE {
let price = (values[(y * SIZE + x) * 2] as u16) | ((values[(y * SIZE + x) * 2 + 1] as u16) << 8);
prices.push(price);
}
}
City::new(prices)
}
pub fn new(prices: Vec<u16>) -> Self {
let mut buyable_house_count = 0;
for &price in &prices {
if price > 0 {
buyable_house_count += 1;
}
}
City { prices, buyable_house_count }
}
pub fn get_price(&self, house: &House) -> u16 {
self.prices[house.y * SIZE + house.x]
}
pub fn get_price_xy(&self, x: usize, y: usize) -> u16 {
self.prices[y * SIZE + x]
}
pub fn is_house(&self, house: &House) -> bool {
self.get_price(&house) > 0
}
pub fn is_house_xy(&self, x: usize, y: usize) -> bool {
self.get_price_xy(x, y) > 0
}
pub fn get_house_count(&self) -> usize {
self.buyable_house_count
}
}
#[derive(Eq, PartialEq, Hash, Copy, Clone)]
pub struct House {
x: usize,
y: usize,
}
impl House {
pub fn new(x: usize, y: usize) -> Self {
House { x, y }
}
pub fn range_rectangle(&self) -> Rectangle {
let top = if self.y <= HOUSE_RANGE { 0 } else { self.y - HOUSE_RANGE };
let bottom = if self.y >= SIZE - 1 - HOUSE_RANGE { SIZE - 1 } else { self.y + HOUSE_RANGE };
let left = if self.x <= HOUSE_RANGE { 0 } else { self.x - HOUSE_RANGE };
let right = if self.x >= SIZE - 1 - HOUSE_RANGE { SIZE - 1 } else { self.x + HOUSE_RANGE };
Rectangle {top, bottom, left, right}
}
}
/// Rectangle - a 2D range with inclusive bounds
pub struct Rectangle {
/// The smaller x coordinate.
left: usize,
/// The bigger x coordinate.
right: usize,
/// The smaller y coordinate.
top: usize,
/// The bigger y coordinate.
bottom: usize,
}
impl fmt::Display for Rectangle {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "L{}-{}R T{}-{}B", self.left, self.right, self.top, self.bottom)
}
}
impl Rectangle {
pub fn is_inside(&self, x: usize, y: usize) -> bool {
self.left <= x && x <= self.right && self.top <= y && y <= self.bottom
}
pub fn width(&self) -> usize {
self.right - self.left
}
pub fn height(&self) -> usize {
self.bottom - self.top
}
}
pub struct HouseLayout<'a> {
city: &'a City,
reachable: Vec<u16>,
houses: Vec<House>,
reachable_houses: usize
}
impl<'a> HouseLayout<'a> {
pub fn new(city: &'a City) -> Self {
HouseLayout { city, reachable: vec![0; SIZE * SIZE], houses: Vec::new(), reachable_houses: 0 }
}
pub fn cover_count(&self, house: House) -> u16 {
self.reachable[house.y * SIZE + house.x]
}
pub fn cover_count_xy(&self, x: usize, y: usize) -> u16 {
self.reachable[y * SIZE + x]
}
pub fn is_covered(&self, house: House) -> bool {
self.cover_count(house) > 0
}
pub fn add_house(&mut self, house: House) -> usize {
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
let index = y as usize * SIZE + x as usize;
if self.reachable[index] == 0 && self.city.is_house_xy(x as usize, y as usize) {
self.reachable_houses += 1;
}
self.reachable[index] += 1;
}
}
self.houses.push(house);
self.houses.len() - 1
}
pub fn remove_house(&mut self, index: usize) {
let house = self.houses.swap_remove(index);
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
let index = y as usize * SIZE + x as usize;
self.reachable[index] -= 1;
if self.reachable[index] == 0 && self.city.is_house_xy(x as usize, y as usize) {
self.reachable_houses -= 1;
}
}
}
}
pub fn is_valid(&self) -> bool {
self.reachable_houses == self.city.buyable_house_count
}
pub fn price(&self) -> u32 {
get_price(self.city, &self.houses)
}
pub fn houses(&self) -> &Vec<House> {
&self.houses
}
}
fn dump_layout(layout: &HouseLayout, best_price: &mut Option<u32>, seed: u64) {
let price = layout.price();
if best_price.is_none() || price < best_price.unwrap() {
*best_price = Some(price);
eprintln!("Printing {} - new best", price);
println!("New best!");
println!("Price {}, seed {}", price, seed);
print_houses(&layout.houses());
println!();
} else {
eprintln!("Printing {}", price);
println!("Price {}, seed {}", price, seed);
print_houses(&layout.houses());
println!();
}
}
mod optimization;
mod population;
mod city;
fn main() {
let city = City::read_from_file("01.in");
@ -209,18 +19,18 @@ fn main() {
let mut rng = StdRng::seed_from_u64(seed);
let mut layout = HouseLayout::new(&city);
eprintln!("Starting random population...");
populate_random(&mut layout, &mut rng);
population::populate_random(&mut layout, &mut rng);
eprintln!("Finished random init, price: {}", layout.price());
loop {
let mut improved = false;
eprintln!("Starting moving individual houses...");
if improve_move_individual_houses(&mut layout, &mut rng) {
if optimization::improve_move_individual_houses(&mut layout, &mut rng) {
dump_layout(&layout, &mut best_price, seed);
improved = true;
}
eprintln!("Finished moving individual houses...");
eprintln!("Starting pairwise house merge...");
if improve_merge_pairwise(&mut layout) {
if optimization::improve_merge_pairwise(&mut layout) {
dump_layout(&layout, &mut best_price, seed);
improved = true;
}
@ -232,303 +42,6 @@ fn main() {
}
}
fn populate_random(layout: &mut HouseLayout, rng: &mut StdRng) {
loop {
loop {
let x = rng.gen_range(0..SIZE);
let y = rng.gen_range(0..SIZE);
let house = House::new(x, y);
if layout.city.is_house_xy(x, y) && !layout.is_covered(house) {
layout.add_house(house);
break;
}
}
if layout.is_valid() {
break;
}
}
}
fn improve_move_individual_houses(layout: &mut HouseLayout, mut rng: &mut StdRng) -> bool {
let mut improved = false;
let mut untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
while untried_houses.len() > 0 {
let house = untried_houses.pop().unwrap();
let house_index = layout.houses().iter().position(|x| *x == house).unwrap();
let move_rectangle = match get_valid_move_rectangle(&layout, house) {
Ok(move_rectangle) => move_rectangle,
Err(RectangleSearchError::Useless) => {
//let old_price = layout.price();
layout.remove_house(house_index);
//let new_price = layout.price();
//let price_diff = new_price as i64 - old_price as i64;
//eprintln!(" candidate is valid, price diff: {}.", price_diff);
//eprintln!("Removed a house (useless), diff {}", price_diff);
//eprintln!("Improved price: {}", new_price);
improved = true;
untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
continue;
}
_ => unreachable!()
};
// TODO: Not needed, can just store best
let mut new_candidates = Vec::new();
for new_y in move_rectangle.top..=move_rectangle.bottom {
for new_x in move_rectangle.left..=move_rectangle.right {
if layout.city.is_house_xy(new_x, new_y) && layout.city.get_price_xy(new_x, new_y) < layout.city.get_price(&house) {
new_candidates.push(House::new(new_x, new_y));
}
}
}
new_candidates.sort_by(|a, b| layout.city.get_price(&a).cmp(&layout.city.get_price(&b)));
if new_candidates.len() == 0 {
//eprintln!("Did not find candidate");
} else {
for (i, &candidate) in new_candidates.iter().enumerate() {
//eprint!("Found candidate {}...", i);
//let old_price = layout.price();
layout.remove_house(house_index);
layout.add_house(candidate);
assert!(layout.is_valid());
//let new_price = layout.price();
//let price_diff = new_price as i64 - old_price as i64;
//eprintln!(" candidate is valid, price diff: {}.", price_diff);
//eprintln!("Improved price: {}", new_price);
improved = true;
untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
break;
}
}
}
improved
}
pub fn improve_merge_pairwise(layout: &mut HouseLayout) -> bool {
let mut improved = false;
loop {
// This here is a hack for being unable to modify the houses while looping through them.
// We instead go through the houses repeatedly and remember which pairs we have already
// tried by hashing their values because they can and do move throughout the layout Vec
// as it's being modified.
let mut checked = HashSet::new();
let mut loop_improved = false;
loop {
let mut merge = None;
'outer_houses: for i in 0..layout.houses().len() {
for j in i + 1..layout.houses().len() {
let house1 = layout.houses()[i];
let house2 = layout.houses()[j];
let x_dist = (house1.x as i32 - house2.x as i32).abs() as usize;
let y_dist = (house1.y as i32 - house2.y as i32).abs() as usize;
if x_dist > 4 * HOUSE_RANGE || y_dist > 4 * HOUSE_RANGE {
// Never close enough to merge
continue;
}
if checked.contains(&(house1, house2)) || checked.contains(&(house2, house1)) {
continue;
} else {
checked.insert((house1, house2));
}
match get_valid_move_rectangle_multiple(&layout, &vec! {house1, house2}) {
Ok(rect) => {
let mut cheapest = None;
for y in rect.top..=rect.bottom {
for x in rect.left..=rect.right {
if !layout.city.is_house_xy(x, y) { continue; }
let price = layout.city.get_price_xy(x, y);
match cheapest {
None => cheapest = Some((x, y, price)),
Some((_, _, cheapest_price)) if price < cheapest_price => cheapest = Some((x, y, price)),
_ => {}
};
}
}
if let Some((x, y, price)) = cheapest {
if price >= layout.city.get_price(&house1) + layout.city.get_price(&house2) {
// Merging not worth
//eprintln!("Merging not worth!");
} else {
merge = Some((i, j, House::new(x, y)));
break 'outer_houses;
}
}
}
Err(RectangleSearchError::Useless) => eprintln!("Found useless pair of houses, not solving!"),
Err(RectangleSearchError::Unsatisfiable) => {}
}
}
}
if let Some((i, j, house)) = merge {
let old_price = layout.price();
assert!(i < j);
layout.remove_house(j);
layout.remove_house(i);
layout.add_house(house);
assert!(layout.is_valid());
let new_price = layout.price();
let price_diff = new_price as i32 - old_price as i32;
eprintln!("Merged two houses, new price {}, diff {}", new_price, price_diff);
improved = true;
loop_improved = true;
} else {
break;
}
}
if !loop_improved {
break;
}
}
improved
}
pub enum RectangleSearchError {
Useless,
Unsatisfiable
}
pub fn get_valid_move_rectangle_multiple(layout: &HouseLayout, houses: &Vec<House>) -> Result<Rectangle, RectangleSearchError> {
// This is a generalization of get_valid_move_rectangle, it's basically the same thing,
// just with a dynamic rectangles_containing_count
// We first establish a bounding box for an that has to be covered if all houses are removed.
let mut covered_rect: Option<Rectangle> = None;
for house in houses {
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
// We count how many rectangles of houses contain this xy position.
let mut rectangles_containing_count = 0;
for house in houses {
let rect = house.range_rectangle();
if rect.is_inside(x, y) {
rectangles_containing_count += 1;
}
}
// If this house is covered by the exact amount of rectangles,
// then removing all input houses would uncover this position.
// It cannot be less than the rectangle count, and more means there
// is another house covering it as well.
if layout.cover_count_xy(x, y) == rectangles_containing_count && layout.city.is_house_xy(x, y) {
if let Some(cover) = &mut covered_rect {
cover.left = cover.left.min(x);
cover.right = cover.right.max(x);
cover.top = cover.top.min(y);
cover.bottom = cover.bottom.max(y);
} else {
covered_rect = Some(Rectangle { left: x, right: x, top: y, bottom: y });
}
}
}
}
};
if covered_rect.is_none() {
// Unnecessary set of houses.
return Err(RectangleSearchError::Useless);
}
let covered_rect = covered_rect.unwrap();
let height_margin = HOUSE_RANGE as i32 - covered_rect.height() as i32;
let width_margin = HOUSE_RANGE as i32 - covered_rect.width() as i32;
let top = (covered_rect.top as i32 - height_margin).max(0) as usize;
let left = (covered_rect.left as i32 - width_margin).max(0) as usize;
let bottom = (covered_rect.bottom + height_margin as usize).min(SIZE - 1);
let right = (covered_rect.right + width_margin as usize).min(SIZE - 1);
if top > bottom || left > right {
// Unsatisfiable rectangle by one house
return Err(RectangleSearchError::Unsatisfiable);
}
Ok(Rectangle { left, right, top, bottom })
}
pub fn get_valid_move_rectangle(layout: &HouseLayout, house: House) -> Result<Rectangle, RectangleSearchError> {
// We first establish a bounding box for an that has to be covered if the house is removed.
let mut covered_rect: Option<Rectangle> = None;
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
if layout.cover_count_xy(x, y) == 1 && layout.city.is_house_xy(x, y) {
// This house is only covered by the house, it has to be covered from the new position as well.
if let Some(cover) = &mut covered_rect {
cover.left = cover.left.min(x);
cover.right = cover.right.max(x);
cover.top = cover.top.min(y);
cover.bottom = cover.bottom.max(y);
} else {
covered_rect = Some(Rectangle { left: x, right: x, top: y, bottom: y });
}
}
}
}
if covered_rect.is_none() {
return Err(RectangleSearchError::Useless)
}
let covered_rect = covered_rect.unwrap();
// The distance of the rectangle from the original box tells us how much the house can move.
let dist_left = covered_rect.left - range_rect.left;
let dist_right = range_rect.right - covered_rect.right;
let dist_top = covered_rect.top - range_rect.top;
let dist_bottom = range_rect.bottom - covered_rect.bottom;
let left = if house.x <= dist_right { 0 } else { house.x - dist_right };
let right = if house.x >= SIZE - 1 - dist_left { SIZE - 1 } else { house.x + dist_left };
let top = if house.y <= dist_bottom { 0 } else { house.y - dist_bottom };
let bottom = if house.y >= SIZE - 1 - dist_top { SIZE - 1 } else { house.y + dist_top };
let valid_move_rectangle = Rectangle {
left, right, top, bottom
};
Ok(valid_move_rectangle)
}
pub fn get_neighbors(city: &City, house: &House) -> Vec<House> {
let mut neighbors = Vec::new();
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
let house = House::new(x as usize, y as usize);
if city.get_price(&house) > 0 {
neighbors.push(house);
}
}
}
neighbors
}
fn print_houses(houses: &Vec<House>) {
println!("{}", houses.len());
for house in houses {
@ -536,73 +49,20 @@ fn print_houses(houses: &Vec<House>) {
}
}
fn get_price(city: &City, houses: &Vec<House>) -> u32 {
let mut price = 0u32;
for house in houses {
price += city.get_price(&house) as u32;
}
price
}
fn is_valid(city: &City, houses: &Vec<House>) -> Option<u32> {
let mut reachable = vec![false; SIZE * SIZE];
let mut price = 0u32;
for house in houses {
assert!(city.prices[house.y * SIZE + house.x] > 0);
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
reachable[y as usize * SIZE + x as usize] = true;
}
}
price += city.get_price(&house) as u32;
}
for y in 0..SIZE {
for x in 0..SIZE {
if !reachable[y * SIZE + x] && city.prices[y * SIZE + x] > 0 {
return None;
}
}
}
Some(price)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn house_rectangle_at_min() {
let house = House::new(0, 0);
let rect = house.range_rectangle();
assert_eq!(rect.top, 0);
assert_eq!(rect.left, 0);
assert_eq!(rect.right, HOUSE_RANGE);
assert_eq!(rect.bottom, HOUSE_RANGE);
fn dump_layout(layout: &HouseLayout, best_price: &mut Option<u32>, seed: u64) {
let price = layout.price();
if best_price.is_none() || price < best_price.unwrap() {
*best_price = Some(price);
eprintln!("Printing {} - new best", price);
println!("New best!");
println!("Price {}, seed {}", price, seed);
print_houses(&layout.houses());
println!();
} else {
eprintln!("Printing {}", price);
println!("Price {}, seed {}", price, seed);
print_houses(&layout.houses());
println!();
}
#[test]
fn house_rectangle_at_max() {
let house = House::new(SIZE - 1, SIZE - 1);
let rect = house.range_rectangle();
assert_eq!(rect.top, SIZE - 1 - HOUSE_RANGE);
assert_eq!(rect.left, SIZE - 1 - HOUSE_RANGE);
assert_eq!(rect.right, SIZE - 1);
assert_eq!(rect.bottom, SIZE - 1);
}
#[test]
fn house_rect_in_middle() {
let house = House::new(SIZE / 2, SIZE / 2);
let rect = house.range_rectangle();
assert_eq!(rect.top, house.y - HOUSE_RANGE);
assert_eq!(rect.left, house.x - HOUSE_RANGE);
assert_eq!(rect.right, house.x + HOUSE_RANGE);
assert_eq!(rect.bottom, house.y + HOUSE_RANGE);
}
}

264
src/optimization.rs
View File

@ -0,0 +1,264 @@
use std::collections::HashSet;
use rand::prelude::{SliceRandom, StdRng};
use crate::city::{Rectangle, HOUSE_RANGE, SIZE, House, HouseLayout};
pub enum RectangleSearchError {
Useless,
Unsatisfiable
}
pub fn get_valid_move_rectangle_multiple(layout: &HouseLayout, houses: &Vec<House>) -> Result<Rectangle, RectangleSearchError> {
// This is a generalization of get_valid_move_rectangle, it's basically the same thing,
// just with a dynamic rectangles_containing_count
// We first establish a bounding box for an that has to be covered if all houses are removed.
let mut covered_rect: Option<Rectangle> = None;
for house in houses {
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
// We count how many rectangles of houses contain this xy position.
let mut rectangles_containing_count = 0;
for house in houses {
let rect = house.range_rectangle();
if rect.is_inside(x, y) {
rectangles_containing_count += 1;
}
}
// If this house is covered by the exact amount of rectangles,
// then removing all input houses would uncover this position.
// It cannot be less than the rectangle count, and more means there
// is another house covering it as well.
if layout.cover_count_xy(x, y) == rectangles_containing_count && layout.city.is_house_xy(x, y) {
if let Some(cover) = &mut covered_rect {
cover.left = cover.left.min(x);
cover.right = cover.right.max(x);
cover.top = cover.top.min(y);
cover.bottom = cover.bottom.max(y);
} else {
covered_rect = Some(Rectangle { left: x, right: x, top: y, bottom: y });
}
}
}
}
};
if covered_rect.is_none() {
// Unnecessary set of houses.
return Err(RectangleSearchError::Useless);
}
let covered_rect = covered_rect.unwrap();
let height_margin = HOUSE_RANGE as i32 - covered_rect.height() as i32;
let width_margin = HOUSE_RANGE as i32 - covered_rect.width() as i32;
let top = (covered_rect.top as i32 - height_margin).max(0) as usize;
let left = (covered_rect.left as i32 - width_margin).max(0) as usize;
let bottom = (covered_rect.bottom + height_margin as usize).min(SIZE - 1);
let right = (covered_rect.right + width_margin as usize).min(SIZE - 1);
if top > bottom || left > right {
// Unsatisfiable rectangle by one house
return Err(RectangleSearchError::Unsatisfiable);
}
Ok(Rectangle { left, right, top, bottom })
}
pub fn get_valid_move_rectangle(layout: &HouseLayout, house: House) -> Result<Rectangle, RectangleSearchError> {
// We first establish a bounding box for an that has to be covered if the house is removed.
let mut covered_rect: Option<Rectangle> = None;
let range_rect = house.range_rectangle();
for y in range_rect.top..=range_rect.bottom {
for x in range_rect.left..=range_rect.right {
if layout.cover_count_xy(x, y) == 1 && layout.city.is_house_xy(x, y) {
// This house is only covered by the house, it has to be covered from the new position as well.
if let Some(cover) = &mut covered_rect {
cover.left = cover.left.min(x);
cover.right = cover.right.max(x);
cover.top = cover.top.min(y);
cover.bottom = cover.bottom.max(y);
} else {
covered_rect = Some(Rectangle { left: x, right: x, top: y, bottom: y });
}
}
}
}
if covered_rect.is_none() {
return Err(RectangleSearchError::Useless)
}
let covered_rect = covered_rect.unwrap();
// The distance of the rectangle from the original box tells us how much the house can move.
let dist_left = covered_rect.left - range_rect.left;
let dist_right = range_rect.right - covered_rect.right;
let dist_top = covered_rect.top - range_rect.top;
let dist_bottom = range_rect.bottom - covered_rect.bottom;
let left = if house.x <= dist_right { 0 } else { house.x - dist_right };
let right = if house.x >= SIZE - 1 - dist_left { SIZE - 1 } else { house.x + dist_left };
let top = if house.y <= dist_bottom { 0 } else { house.y - dist_bottom };
let bottom = if house.y >= SIZE - 1 - dist_top { SIZE - 1 } else { house.y + dist_top };
let valid_move_rectangle = Rectangle {
left, right, top, bottom
};
Ok(valid_move_rectangle)
}
pub fn improve_move_individual_houses(layout: &mut HouseLayout, mut rng: &mut StdRng) -> bool {
let mut improved = false;
let mut untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
while untried_houses.len() > 0 {
let house = untried_houses.pop().unwrap();
let house_index = layout.houses().iter().position(|x| *x == house).unwrap();
let move_rectangle = match get_valid_move_rectangle(&layout, house) {
Ok(move_rectangle) => move_rectangle,
Err(RectangleSearchError::Useless) => {
//let old_price = layout.price();
layout.remove_house(house_index);
//let new_price = layout.price();
//let price_diff = new_price as i64 - old_price as i64;
//eprintln!(" candidate is valid, price diff: {}.", price_diff);
//eprintln!("Removed a house (useless), diff {}", price_diff);
//eprintln!("Improved price: {}", new_price);
improved = true;
untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
continue;
}
_ => unreachable!()
};
// TODO: Not needed, can just store best
let mut new_candidates = Vec::new();
for new_y in move_rectangle.top..=move_rectangle.bottom {
for new_x in move_rectangle.left..=move_rectangle.right {
if layout.city.is_house_xy(new_x, new_y) && layout.city.get_price_xy(new_x, new_y) < layout.city.get_price(&house) {
new_candidates.push(House::new(new_x, new_y));
}
}
}
new_candidates.sort_by(|a, b| layout.city.get_price(&a).cmp(&layout.city.get_price(&b)));
if new_candidates.len() == 0 {
//eprintln!("Did not find candidate");
} else {
for (i, &candidate) in new_candidates.iter().enumerate() {
//eprint!("Found candidate {}...", i);
//let old_price = layout.price();
layout.remove_house(house_index);
layout.add_house(candidate);
assert!(layout.is_valid());
//let new_price = layout.price();
//let price_diff = new_price as i64 - old_price as i64;
//eprintln!(" candidate is valid, price diff: {}.", price_diff);
//eprintln!("Improved price: {}", new_price);
improved = true;
untried_houses = layout.houses().clone();
untried_houses.shuffle(&mut rng);
break;
}
}
}
improved
}
pub fn improve_merge_pairwise(layout: &mut HouseLayout) -> bool {
let mut improved = false;
loop {
// This here is a hack for being unable to modify the houses while looping through them.
// We instead go through the houses repeatedly and remember which pairs we have already
// tried by hashing their values because they can and do move throughout the layout Vec
// as it's being modified.
let mut checked = HashSet::new();
let mut loop_improved = false;
loop {
let mut merge = None;
'outer_houses: for i in 0..layout.houses().len() {
for j in i + 1..layout.houses().len() {
let house1 = layout.houses()[i];
let house2 = layout.houses()[j];
let x_dist = (house1.x as i32 - house2.x as i32).abs() as usize;
let y_dist = (house1.y as i32 - house2.y as i32).abs() as usize;
if x_dist > 4 * HOUSE_RANGE || y_dist > 4 * HOUSE_RANGE {
// Never close enough to merge
continue;
}
if checked.contains(&(house1, house2)) || checked.contains(&(house2, house1)) {
continue;
} else {
checked.insert((house1, house2));
}
match get_valid_move_rectangle_multiple(&layout, &vec! {house1, house2}) {
Ok(rect) => {
let mut cheapest = None;
for y in rect.top..=rect.bottom {
for x in rect.left..=rect.right {
if !layout.city.is_house_xy(x, y) { continue; }
let price = layout.city.get_price_xy(x, y);
match cheapest {
None => cheapest = Some((x, y, price)),
Some((_, _, cheapest_price)) if price < cheapest_price => cheapest = Some((x, y, price)),
_ => {}
};
}
}
if let Some((x, y, price)) = cheapest {
if price >= layout.city.get_price(&house1) + layout.city.get_price(&house2) {
// Merging not worth
//eprintln!("Merging not worth!");
} else {
merge = Some((i, j, House::new(x, y)));
break 'outer_houses;
}
}
}
Err(RectangleSearchError::Useless) => eprintln!("Found useless pair of houses, not solving!"),
Err(RectangleSearchError::Unsatisfiable) => {}
}
}
}
if let Some((i, j, house)) = merge {
let old_price = layout.price();
assert!(i < j);
layout.remove_house(j);
layout.remove_house(i);
layout.add_house(house);
assert!(layout.is_valid());
let new_price = layout.price();
let price_diff = new_price as i32 - old_price as i32;
eprintln!("Merged two houses, new price {}, diff {}", new_price, price_diff);
improved = true;
loop_improved = true;
} else {
break;
}
}
if !loop_improved {
break;
}
}
improved
}

21
src/population.rs
View File

@ -0,0 +1,21 @@
use rand::Rng;
use crate::city::{SIZE, House, HouseLayout};
use rand::prelude::StdRng;
pub(crate) fn populate_random(layout: &mut HouseLayout, rng: &mut StdRng) {
loop {
loop {
let x = rng.gen_range(0..SIZE);
let y = rng.gen_range(0..SIZE);
let house = House::new(x, y);
if layout.city.is_house_xy(x, y) && !layout.is_covered(house) {
layout.add_house(house);
break;
}
}
if layout.is_valid() {
break;
}
}
}
Write Preview
Loading…
Cancel
Save