This commit is contained in:
Maix0 2023-08-21 00:02:55 +02:00
commit cc3112ad3d
8 changed files with 1118 additions and 0 deletions

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.envrc Normal file
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use flake --impure

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/target
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"locked": {
"lastModified": 1689068808,
"narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"flake-utils_4": {
"inputs": {
"systems": "systems_3"
},
"locked": {
"lastModified": 1681202837,
"narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "cfacdce06f30d2b68473a46042957675eebb3401",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"naersk": {
"inputs": {
"nixpkgs": "nixpkgs"
},
"locked": {
"lastModified": 1671096816,
"narHash": "sha256-ezQCsNgmpUHdZANDCILm3RvtO1xH8uujk/+EqNvzIOg=",
"owner": "nix-community",
"repo": "naersk",
"rev": "d998160d6a076cfe8f9741e56aeec7e267e3e114",
"type": "github"
},
"original": {
"owner": "nix-community",
"repo": "naersk",
"type": "github"
}
},
"naersk_2": {
"inputs": {
"nixpkgs": "nixpkgs_3"
},
"locked": {
"lastModified": 1679567394,
"narHash": "sha256-ZvLuzPeARDLiQUt6zSZFGOs+HZmE+3g4QURc8mkBsfM=",
"owner": "nix-community",
"repo": "naersk",
"rev": "88cd22380154a2c36799fe8098888f0f59861a15",
"type": "github"
},
"original": {
"owner": "nix-community",
"repo": "naersk",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1673947312,
"narHash": "sha256-xx/2nRwRy3bXrtry6TtydKpJpqHahjuDB5sFkQ/XNDE=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "2d38b664b4400335086a713a0036aafaa002c003",
"type": "github"
},
"original": {
"id": "nixpkgs",
"type": "indirect"
}
},
"nixpkgs_2": {
"locked": {
"lastModified": 1673947312,
"narHash": "sha256-xx/2nRwRy3bXrtry6TtydKpJpqHahjuDB5sFkQ/XNDE=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "2d38b664b4400335086a713a0036aafaa002c003",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_3": {
"locked": {
"lastModified": 1683777345,
"narHash": "sha256-V2p/A4RpEGqEZussOnHYMU6XglxBJGCODdzoyvcwig8=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "635a306fc8ede2e34cb3dd0d6d0a5d49362150ed",
"type": "github"
},
"original": {
"id": "nixpkgs",
"type": "indirect"
}
},
"nixpkgs_4": {
"locked": {
"lastModified": 1683777345,
"narHash": "sha256-V2p/A4RpEGqEZussOnHYMU6XglxBJGCODdzoyvcwig8=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "635a306fc8ede2e34cb3dd0d6d0a5d49362150ed",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_5": {
"locked": {
"lastModified": 1692494774,
"narHash": "sha256-noGVoOTyZ2Kr5OFglzKYOX48cx3hggdCPbXrYMG2FDw=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "3476a10478587dec90acb14ec6bde0966c545cc0",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_6": {
"locked": {
"lastModified": 1681358109,
"narHash": "sha256-eKyxW4OohHQx9Urxi7TQlFBTDWII+F+x2hklDOQPB50=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "96ba1c52e54e74c3197f4d43026b3f3d92e83ff9",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"cargo-semver-checks": "cargo-semver-checks",
"cargo-workspace": "cargo-workspace",
"flake-utils": "flake-utils_3",
"nixpkgs": "nixpkgs_5",
"rust-overlay": "rust-overlay"
}
},
"rust-overlay": {
"inputs": {
"flake-utils": "flake-utils_4",
"nixpkgs": "nixpkgs_6"
},
"locked": {
"lastModified": 1692497375,
"narHash": "sha256-50w6YzSA+0utDmBY0TPndRGYypBbJrKQHlOFGedo70I=",
"owner": "oxalica",
"repo": "rust-overlay",
"rev": "41ea15ff958038712f108332d68f32745af9dd35",
"type": "github"
},
"original": {
"owner": "oxalica",
"repo": "rust-overlay",
"type": "github"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
},
"systems_2": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
},
"systems_3": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

45
flake.nix Normal file
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{
description = "A basic flake with a shell";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
inputs.flake-utils.url = "github:numtide/flake-utils";
inputs.rust-overlay.url = "github:oxalica/rust-overlay";
inputs.cargo-workspace.url = "github:Maix0/cargo-ws-flake";
inputs.cargo-semver-checks.url = "github:Maix0/cargo-semver-checks-flake";
outputs = {
self,
nixpkgs,
flake-utils,
rust-overlay,
cargo-workspace,
cargo-semver-checks,
}:
flake-utils.lib.eachDefaultSystem (system: let
pkgs = import nixpkgs {
inherit system;
overlays = [(import rust-overlay)];
};
in {
devShell = with pkgs; let
cargo-ws = cargo-workspace.packages.${system}.default;
cargo-sc = cargo-semver-checks.packages.${system}.default;
rust_dev = rust-bin.nightly.latest.default.override {
extensions = ["miri" "rust-src"];
};
in
mkShell {
nativeBuildInputs = [
pkgs.bashInteractive
];
buildInputs = [
# Rust
rust_dev
cargo-sc
cargo-sc
cargo-ws
fastmod
];
};
});
}

163
src/bsq.rs Normal file
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use rand::prelude::Distribution;
pub struct Bucket {
pub height: usize,
pub width: usize,
pub chunksize: usize,
pub chunkmask: usize,
chunks: Vec<Vec<Vec<Point>>>,
}
#[derive(Clone, Copy)]
pub struct Point {
pub x: u16,
pub y: u16,
}
impl Bucket {
pub fn new(height: usize, width: usize, chunksize: usize) -> Self {
Self {
chunks: std::iter::repeat(
std::iter::repeat(Vec::with_capacity(chunksize))
.take(width / chunksize + 1)
.collect::<Vec<_>>(),
)
.take(height / chunksize + 1)
.collect(),
height,
width,
chunksize,
chunkmask: !(chunksize - 1),
}
}
pub fn insert(&mut self, pts: Point) {
self.chunks[pts.y as usize / self.chunksize][pts.x as usize / self.chunksize].push(pts);
}
pub fn get_bucket(&self, pts: Point) -> &[Point] {
self.chunks[pts.y as usize / self.chunksize][pts.x as usize / self.chunksize].as_slice()
}
}
fn create_grid(width: usize, height: usize, density: f32) -> Vec<bool> {
rand::distributions::Bernoulli::new(density as f64)
.unwrap()
.sample_iter(&mut rand::thread_rng())
.take(width * height)
.collect()
}
fn is_rectangle_valid(bucket: &Bucket, Point { x, y }: Point, size: u16, grid_size: usize) -> bool {
if (x as usize + size as usize) >= grid_size || (y as usize + size as usize) >= grid_size {
return false;
}
for y_ in ((y as usize & bucket.chunkmask)
..((y as usize + size as usize + bucket.chunksize) & bucket.chunkmask))
.step_by(bucket.chunksize)
{
for x_ in ((x as usize & bucket.chunkmask)
..((x as usize + size as usize + bucket.chunksize) & bucket.chunkmask))
.step_by(bucket.chunksize)
{
let cur_bucket = bucket.get_bucket(Point {
x: x_ as u16,
y: y_ as u16,
});
for &p in cur_bucket {
if (x <= p.x && p.x <= x + size) || (y <= p.y && p.y <= y + size) {
return false;
}
}
}
}
true
}
pub fn run(
grid_size: usize,
bucket_size: usize,
density: f32,
runs: usize,
n_len: (usize, usize),
) -> Vec<std::time::Duration> {
(0..runs)
.map(|_| {
let grid = create_grid(grid_size, grid_size, density);
let mut bucket = Bucket::new(grid_size, grid_size, bucket_size);
/*println!(
"({}) [{:>3}/{:>3}] gs={grid_size} bs={bucket_size} d={density:.1}",
chrono::Local::now().format("%a %b %e %T"),
(n_len.0) + 1,
n_len.1
);*/
let start = std::time::Instant::now();
// List of all points
for y in 0..grid_size {
for x in 0..grid_size {
if grid[y * grid_size + x] {
bucket.insert(Point {
x: x as u16,
y: y as u16,
});
}
}
}
// Solving
let mut max: (Point, u16) = (Point { x: 0, y: 0 }, 0);
for y in 0..grid_size {
for x in 0..grid_size {
/*
let mut size = 4;
let mut bottom = 0;
let mut top = u16::MAX;
while bottom < top {
if is_rectangle_valid(
&bucket,
Point {
x: x as u16,
y: y as u16,
},
size,
grid_size,
) {
bottom = size;
size *= 3;
size /= 2;
} else {
top = size;
size = ((size + bottom + 1) / 2).max(bottom);
}
}*/
let mut size = 1;
while is_rectangle_valid(
&bucket,
Point {
x: x as u16,
y: y as u16,
},
size,
grid_size,
) {
size += 1;
}
size -= 1;
if size > max.1 {
max = (
Point {
x: x as u16,
y: y as u16,
},
size,
);
}
}
}
start.elapsed()
})
.collect()
}

41
src/main.rs Normal file
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use itertools::Itertools;
use rayon::iter::ParallelIterator;
use rayon::prelude::ParallelBridge;
mod bsq;
const RUNS: usize = 256;
#[derive(serde::Serialize)]
struct Run {
chunksize: usize,
gridsize: usize,
density: f32,
runs: usize,
results: Vec<std::time::Duration>,
}
fn main() {
let len = (1..13)
.cartesian_product(1..13)
.filter(|&(grid_size, chunk_size)| (grid_size - 5 <= chunk_size && chunk_size <= grid_size))
.flat_map(|t| std::iter::repeat(t).zip((1..10).map(|i| i as f32 / 10.0)))
.count();
let params = (1..13)
.cartesian_product(1..13)
.filter(|&(grid_size, chunk_size)| (grid_size - 5 <= chunk_size && chunk_size <= grid_size))
.flat_map(|t| std::iter::repeat(t).zip((1..10).map(|i| i as f32 / 10.0)))
.map(|((grid_size, chunk_size), density)| (1 << grid_size, 1 << chunk_size, density));
let res = params
.enumerate()
.par_bridge()
.map(|(n, (gridsize, chunksize, density))| Run {
chunksize,
gridsize,
density,
runs: RUNS,
results: bsq::run(gridsize, chunksize, density, RUNS, (n, len)),
})
.collect::<Vec<_>>();
serde_json::to_writer(std::fs::File::open("./data.json").unwrap(), &res).unwrap();
}