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Lukas Wölfer
2025-08-21 01:27:26 +02:00
parent aa5d621e00
commit fd5f4dd2ab
26 changed files with 1375 additions and 0 deletions

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[[package]]
name = "windows_i686_gnu"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
[[package]]
name = "windows_i686_gnullvm"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
[[package]]
name = "windows_i686_msvc"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
[[package]]
name = "windows_x86_64_gnu"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
[[package]]
name = "windows_x86_64_gnullvm"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
[[package]]
name = "windows_x86_64_msvc"
version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
[[package]]
name = "wit-bindgen-rt"
version = "0.39.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
dependencies = [
"bitflags",
]
[[package]]
name = "zerocopy"
version = "0.8.26"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1039dd0d3c310cf05de012d8a39ff557cb0d23087fd44cad61df08fc31907a2f"
dependencies = [
"zerocopy-derive",
]
[[package]]
name = "zerocopy-derive"
version = "0.8.26"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9ecf5b4cc5364572d7f4c329661bcc82724222973f2cab6f050a4e5c22f75181"
dependencies = [
"proc-macro2",
"quote",
"syn",
]

7
optimizer/Cargo.toml Normal file
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@@ -0,0 +1,7 @@
[workspace]
resolver = "3"
members = ["canvas"]
[profile.release]
debug = "line-tables-only"
[build]
rustflags = ["-C", "force-frame-pointers=yes"]

2
optimizer/README.md Normal file
View File

@@ -0,0 +1,2 @@
[![Build Status](https://gitea.thasky.one/lukas/canvas-boardgame/actions/workflows/test.yaml/badge.svg)](https://gitea.thasky.one/lukas/canvas-boardgame/actions)

1
optimizer/canvas/.gitignore vendored Normal file
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@@ -0,0 +1 @@
/target

7
optimizer/canvas/Cargo.lock generated Normal file
View File

@@ -0,0 +1,7 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
[[package]]
name = "canvas"
version = "0.1.0"

View File

@@ -0,0 +1,16 @@
[package]
name = "canvas"
version = "0.1.0"
edition = "2024"
[dependencies]
arbitrary = "1.4.1"
itertools = "0.14.0"
[dev-dependencies]
criterion = { version = "0.7", features = ["html_reports"] }
rand = "0.9.2"
[[bench]]
name = "painting"
harness = false

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@@ -0,0 +1,73 @@
use arbitrary::{Arbitrary, Unstructured};
use canvas::{Card, draw_painting};
use criterion::{BenchmarkId, Criterion, criterion_group, criterion_main};
use rand::{Rng, rngs::StdRng};
use std::{hint::black_box, time::Duration};
use crate::random_card::RandomCard;
mod random_card;
fn criterion_benchmark(c: &mut Criterion) {
let cards = vec![
Card::from_dbg_string(".ttt."),
Card::from_dbg_string("t.l.."),
Card::from_dbg_string("ll..pt"),
];
assert_eq!(draw_painting(&cards, &[]), Some([0, 1, 2]));
c.bench_function("painting optimizer", |b| {
b.iter(|| {
draw_painting(&black_box(cards.clone()), &[]);
});
});
}
fn random_card_pool<const N: usize>(rng: &mut StdRng) -> Vec<Card> {
<[RandomCard; N] as Arbitrary>::arbitrary(&mut Unstructured::new(&rng.random::<[u8; 32]>()))
.unwrap()
.map(|x| x.0)
.to_vec()
}
fn from_elem(c: &mut Criterion) {
use rand::SeedableRng;
// Define a seed. This can be any value that implements the `SeedableRng` trait.
let seed: [u8; 32] = [
8u64.to_be_bytes(),
8u64.to_be_bytes(),
8u64.to_be_bytes(),
8u64.to_be_bytes(),
]
.concat()
.try_into()
.unwrap();
// Create a new RNG with the specified seed.
let mut rng: StdRng = SeedableRng::from_seed(seed);
// Generate a random number using the seeded RNG.
let card_pool = [
random_card_pool::<4>(&mut rng),
random_card_pool::<8>(&mut rng),
random_card_pool::<16>(&mut rng),
random_card_pool::<32>(&mut rng),
random_card_pool::<64>(&mut rng),
random_card_pool::<128>(&mut rng),
];
let mut group = c.benchmark_group("from_elem");
for size in card_pool.iter() {
group.bench_with_input(BenchmarkId::from_parameter(size.len()), size, |b, size| {
b.iter(|| {
draw_painting(&black_box(size.clone()), &[])
});
});
}
group.finish();
}
criterion_group!(name = benches;
config = Criterion::default()
.warm_up_time(Duration::from_millis(100))
.measurement_time(Duration::from_millis(500));
targets = criterion_benchmark, from_elem);
criterion_main!(benches);

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@@ -0,0 +1,30 @@
use arbitrary::{Arbitrary, Unstructured};
use canvas::{Card, CardField};
#[derive(Debug, Clone)]
pub struct RandomCard(pub(crate) Card);
#[derive(Debug)]
struct RandomCardField(CardField);
impl<'a> Arbitrary<'a> for RandomCardField {
fn arbitrary(u: &mut Unstructured<'a>) -> arbitrary::Result<Self> {
let i = u.int_in_range(0..=15)?;
if let Ok(w) = CardField::try_from_bits(i) {
Ok(RandomCardField(w))
} else {
Ok(RandomCardField(CardField::Empty))
}
}
}
impl<'a> Arbitrary<'a> for RandomCard {
fn arbitrary(u: &mut Unstructured<'a>) -> arbitrary::Result<Self> {
let mut r = vec![];
for _ in 0..5 {
r.push(u.arbitrary::<RandomCardField>()?)
}
let w: [RandomCardField; 5] = r.try_into().unwrap();
let r = Card::from(w.map(|x: RandomCardField| x.0));
Ok(RandomCard(r))
}
}

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@@ -0,0 +1,121 @@
use crate::{CardField, Icon};
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
// There are 60 cards in the base set
pub struct Card {
field: u32,
}
pub struct CardFieldIter {
index: u8,
field: u32,
}
impl Iterator for CardFieldIter {
type Item = CardField;
fn next(&mut self) -> Option<Self::Item> {
if self.index < 5 {
let old_index = self.index;
self.index += 1;
let bitmask = (1 << (CardField::BITPACKED_SIZE as u8)) - 1;
let result = (self.field >> (CardField::BITPACKED_SIZE as u8 * old_index)) & bitmask;
Some(CardField::try_from_bits(result as u8).unwrap())
} else {
None
}
}
}
impl From<[CardField; 5]> for Card {
fn from(value: [CardField; 5]) -> Self {
let field = value
.iter()
.map(|x| x.to_bits())
.zip((0u8..).step_by(CardField::BITPACKED_SIZE))
.map(|(a, shift_count)| (a as u32) << (shift_count))
.fold(0u32, |a, b| a | b);
Self { field }
}
}
impl Card {
pub fn field_iter(&self) -> CardFieldIter {
CardFieldIter {
index: 0,
field: self.field,
}
}
pub const fn empty() -> Self {
Self { field: u32::MAX }
}
pub fn from_dbg_string(text: &str) -> Self {
let mut result = [CardField::Empty; 5];
let mut current_field = 0;
let mut char_iter = text.chars();
let match_icon = |x: char| {
let field = match x {
's' => Icon::Square,
'c' => Icon::Circle,
't' => Icon::Triangle,
'l' => Icon::Color,
_ => return None,
};
Some(field)
};
while let Some(c) = char_iter.next() {
if let Some(f) = match_icon(c) {
result[current_field] = CardField::Icon(f);
current_field += 1;
continue;
}
let field = match c {
'p' => {
let f = match_icon(char_iter.next().expect("No icon after point symbol"))
.expect("Incorrect icon after point symbol");
CardField::PointsPer(f)
}
'd' => {
let f1 =
match_icon(char_iter.next().expect("No first icon after double symbol"))
.expect("Incorrect first icon after double symbol");
let f2 = match_icon(
char_iter
.next()
.expect("No second icon after double symbol"),
)
.expect("Incorrect second icon after double symbol");
CardField::DoubleIcon(f1, f2)
}
'.' => CardField::Empty,
'-' => continue,
_ => panic!("Unknown character {c}"),
};
result[current_field] = field;
current_field += 1;
}
result.into()
}
}
#[cfg(test)]
mod tests {
use crate::{CardField, Icon, card::Card};
#[test]
fn test_correctness() {
let card = Card::from_dbg_string("l..t.");
println!("{:0x}", card.field);
assert_eq!(
card.field_iter().collect::<Vec<_>>(),
vec![
CardField::Icon(Icon::Color),
CardField::Empty,
CardField::Empty,
CardField::Icon(Icon::Triangle),
CardField::Empty,
]
)
}
}

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@@ -0,0 +1,123 @@
use crate::Card;
use crate::CardField;
use crate::Icon;
use crate::Painting;
#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub(crate) struct IconBitfield {
circle: u8,
square: u8,
triangle: u8,
color: u8,
points: u8,
}
impl IconBitfield {
pub fn get_icon_bits(&self, icon: Icon) -> u8 {
match icon {
Icon::Circle => self.circle,
Icon::Square => self.square,
Icon::Triangle => self.triangle,
Icon::Color => self.color,
}
}
pub fn get_point_bits(&self) -> u8 {
self.points
}
fn add_icon(&mut self, icon: Icon, index: u8) {
let field = match icon {
Icon::Circle => &mut self.circle,
Icon::Square => &mut self.square,
Icon::Triangle => &mut self.triangle,
Icon::Color => &mut self.color,
};
*field |= 1 << index;
}
pub fn add_field(&mut self, field: CardField, index: u8) {
debug_assert!(index < 5);
match field {
CardField::Icon(icon) => self.add_icon(icon, index),
CardField::DoubleIcon(icon1, icon2) => {
self.add_icon(icon1, index);
self.add_icon(icon2, index);
}
CardField::PointsPer(_) => self.points |= 1 << index,
CardField::Empty => (),
}
}
pub fn new(card: &Card) -> Self {
let mut result = Self::default();
(0u8..)
.zip(card.field_iter())
.for_each(|(index, field)| result.add_field(field, index));
result
}
pub fn from_painting(painting: &Painting) -> Self {
let mut bits = Self::new(&painting[0]);
bits.layer_below(&Self::new(&painting[1]))
.layer_below(&Self::new(&painting[2]));
bits
}
pub fn all_fields(&self) -> u8 {
self.circle | self.square | self.triangle | self.color | self.points
}
/// Result of putting the other card below this one
pub fn layer_below(&mut self, other: &Self) -> &mut Self {
// 1 x 0 = 0
// 0 x 0 = 0
// 0 x 1 = 1
// 1 x 1 = 0
// Should be !a & b
let bitmask = !self.all_fields() & other.all_fields();
self.circle |= other.circle & bitmask;
self.square |= other.square & bitmask;
self.triangle |= other.triangle & bitmask;
self.color |= other.color & bitmask;
self.points |= other.points & bitmask;
self
}
}
#[cfg(test)]
mod tests {
use crate::{Icon, icon_bitfield::IconBitfield};
#[test]
fn test_add_field() {
let mut x: IconBitfield = Default::default();
x.add_icon(Icon::Circle, 2);
let expected = IconBitfield {
circle: 0b00100,
..Default::default()
};
assert_eq!(x, expected);
}
#[test]
fn test_layer_below() {
let mut a: IconBitfield = IconBitfield {
color: 0b00010,
points: 0b01000,
..Default::default()
};
let b = IconBitfield {
triangle: a.get_point_bits(),
square: 0b10000,
..Default::default()
};
let expected = IconBitfield {
color: a.get_icon_bits(Icon::Color),
points: a.get_point_bits(),
square: b.get_icon_bits(Icon::Square),
..Default::default()
};
a.layer_below(&b);
assert_eq!(a, expected);
}
}

152
optimizer/canvas/src/lib.rs Normal file
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@@ -0,0 +1,152 @@
#![allow(dead_code)]
#![warn(clippy::unwrap_used, clippy::expect_used)]
use crate::objective::Objective;
mod card;
mod icon_bitfield;
mod objective;
mod optimizer;
pub use card::Card;
pub use optimizer::draw_painting;
#[derive(Debug)]
struct Shop {
cards: [Card; 5],
coins: [u8; 5],
}
#[repr(u8)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum Icon {
Circle = 0b00,
Square = 0b01,
Triangle = 0b10,
Color = 0b11,
}
impl TryFrom<u8> for Icon {
type Error = ();
fn try_from(value: u8) -> Result<Self, Self::Error> {
ICON_ORDER
.get(value as usize)
.map(|x| Ok(*x))
.unwrap_or(Err(()))
}
}
const ICON_ORDER: [Icon; 4] = [Icon::Circle, Icon::Square, Icon::Triangle, Icon::Color];
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub enum CardField {
Icon(Icon),
PointsPer(Icon),
DoubleIcon(Icon, Icon),
#[default]
Empty,
}
impl CardField {
pub const BITPACKED_SIZE: usize = 4;
pub fn try_from_bits(bits: u8) -> Result<Self, ()> {
{
let bits = bits & ((1 << Self::BITPACKED_SIZE) - 1);
if (bits) == 0b1111 {
Ok(Self::Empty)
} else if (bits & (1 << 3)) != 0 {
let bits = bits & ((1 << 3) - 1);
if bits == 5 {
Ok(Self::DoubleIcon(Icon::Triangle, Icon::Color))
} else if bits >= 3 {
Ok(Self::DoubleIcon(
Icon::Square,
Icon::try_from(bits + 2 - 3)?,
))
} else {
Ok(Self::DoubleIcon(Icon::Circle, Icon::try_from(bits + 1)?))
}
} else if bits & (1 << 2) != 0 {
let bits = bits & ((1 << 2) - 1);
Ok(Self::PointsPer(Icon::try_from(bits)?))
} else {
Ok(Self::Icon(Icon::try_from(bits)?))
}
}
}
/// There are only 4 + 4 + 6 + 1 possibilities when double icons are sorted
fn to_bits(self) -> u8 {
match self {
CardField::Icon(icon) => icon as u8,
CardField::PointsPer(icon) => icon as u8 | (1 << 2),
CardField::DoubleIcon(mut a, mut b) => {
debug_assert_ne!(a, b);
if a > b {
(a, b) = (b, a);
}
let tag = match a {
// 0..=2
Icon::Circle => ICON_ORDER.iter().position(|x| b == *x).unwrap() as u8 - 1,
// 3..=4
Icon::Square => ICON_ORDER.iter().position(|x| b == *x).unwrap() as u8 - 2 + 3,
// 5
Icon::Triangle => {
debug_assert_eq!(b, Icon::Color);
5
}
Icon::Color => panic!("Color as first double is not possible"),
};
tag | (1 << 3)
}
CardField::Empty => (1 << 4) - 1,
}
}
}
#[derive(Debug)]
struct Player {
cards: Vec<Card>,
coins: u8,
paintings: Vec<[Card; 3]>,
}
type Painting = [Card; 3];
#[derive(Debug)]
struct Board {
players: Vec<Player>,
shop: Shop,
objectives: [CriteriaCard; 4],
}
#[derive(Debug, Clone, Copy, Default)]
struct PointThresholds(u32);
impl PointThresholds {
const BITFIELD_SIZE: usize = 4;
pub fn len(&self) -> usize {
(self.0.ilog2() as usize).div_ceil(Self::BITFIELD_SIZE)
}
pub fn new(points: &[u8]) -> Self {
let mut result = Self(0);
for (index, p) in points.iter().enumerate() {
result.set(index, *p);
}
result
}
fn set(&mut self, index: usize, value: u8) {
debug_assert!(value < (1 << Self::BITFIELD_SIZE));
self.0 |= u32::from(value) << (index * Self::BITFIELD_SIZE);
}
pub fn get(&self, index: usize) -> u8 {
let bitmask = (1u8 << Self::BITFIELD_SIZE) - 1;
(self.0 >> (index * Self::BITFIELD_SIZE)) as u8 & bitmask
}
}
#[derive(Debug)]
pub struct CriteriaCard {
objective: Objective,
// Points depending on how often the criteria was met
points: PointThresholds,
}

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@@ -0,0 +1,184 @@
use crate::{icon_bitfield::IconBitfield, Icon, Painting, ICON_ORDER};
// There are 12 objectives/criteria in the base set
#[derive(Debug)]
pub enum Objective {
AllFields,
/// Must use every icon in the vector at least once
IconsUsed(IconSet),
/// The count of all icons in the vec `.0` combined is exactly `.1`
ExactlyNIcons((IconSet, u8)),
/// These icons are in fields exactly next to each other
/// One icon can only be the neighbor of one other icon
Neighbors(Vec<(Icon, Icon)>),
/// Both icons are on one card, but not adjacent
DistantNeighbors(Vec<(Icon, Icon)>),
NInARow(Icon, u8),
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct IconSet(u8);
pub struct IconSetIterator {
icon_set: IconSet,
index: u8,
}
impl From<&[Icon]> for IconSet {
fn from(value: &[Icon]) -> Self {
let v = value
.iter()
.map(|x| 1 << ICON_ORDER.iter().position(|v| x == v).unwrap())
.fold(0, |a, b| a | b);
Self(v)
}
}
impl IconSet {
pub fn len(&self) -> usize {
self.0.count_ones() as usize
}
}
impl Iterator for IconSetIterator {
type Item = Icon;
fn next(&mut self) -> Option<Self::Item> {
while self.index < 4 {
let old_index = self.index;
self.index += 1;
if self.icon_set.0 & (1 << old_index) != 0 {
return Some(*ICON_ORDER.get(old_index as usize).unwrap());
}
}
None
}
}
impl IntoIterator for IconSet {
type Item = Icon;
type IntoIter = IconSetIterator;
fn into_iter(self) -> Self::IntoIter {
IconSetIterator {
icon_set: self,
index: 0,
}
}
}
impl Objective {
pub fn count_matches_bitfield(&self, bitfield: &IconBitfield) -> u8 {
match self {
Objective::AllFields => {
if bitfield.all_fields() == 0b11111 {
1
} else {
0
}
}
Objective::IconsUsed(icons) => {
let bits = bitfield;
if icons.into_iter().all(|i| bits.get_icon_bits(i) > 0) {
1
} else {
0
}
}
Objective::ExactlyNIcons((icons, count)) => {
let bits = bitfield;
if icons
.into_iter()
.map(|i| bits.get_icon_bits(i).count_ones())
.sum::<u32>() as u8
== *count
{
1
} else {
0
}
}
Objective::NInARow(icon, count) => {
let mut bits = bitfield.get_icon_bits(*icon);
let bitmask = (1 << count) - 1;
let mut res_count = 0;
while bits > 0 {
if (bits) & bitmask == bitmask {
res_count += 1;
bits >>= count;
} else {
bits >>= 1;
}
}
res_count
// Objective::Neighbors(items) => todo!(),
// Objective::DistantNeighbors(items) => todo!(),
}
_ => todo!(),
}
}
pub fn count_matches(&self, painting: &Painting) -> u8 {
self.count_matches_bitfield(&IconBitfield::from_painting(painting))
}
}
#[cfg(test)]
mod tests {
use crate::{
Card, Icon, Painting,
objective::{IconSet, Objective},
};
#[test]
fn test_all_fields() {
let v: Painting = [
Card::from_dbg_string("...ct"),
Card::from_dbg_string("s.s.."),
Card::from_dbg_string(".l.t."),
];
assert_eq!(Objective::AllFields.count_matches(&v), 1);
}
#[test]
fn test_n_in_a_row() {
let v: Painting = [
Card::from_dbg_string("...ll"),
Card::from_dbg_string("ll..."),
Card::from_dbg_string("..t.."),
];
assert_eq!(Objective::NInARow(Icon::Color, 2).count_matches(&v), 2);
let tricky_two: Painting = [
Card::from_dbg_string("...ll"),
Card::from_dbg_string("tl..."),
Card::from_dbg_string("..lc."),
];
assert_eq!(
Objective::NInARow(Icon::Color, 2).count_matches(&tricky_two),
2
);
}
#[test]
fn test_icons_used() {
let v: Painting = [
Card::from_dbg_string("...ll"),
Card::from_dbg_string("ll..."),
Card::from_dbg_string("..t.."),
];
assert_eq!(
Objective::IconsUsed(IconSet::from([Icon::Color].as_slice())).count_matches(&v),
1
);
assert_eq!(
Objective::IconsUsed(IconSet::from([Icon::Triangle].as_slice())).count_matches(&v),
1
);
assert_eq!(
Objective::IconsUsed(IconSet::from([Icon::Circle].as_slice())).count_matches(&v),
0
);
}
}

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use itertools::Itertools;
use crate::{CardField, CriteriaCard, card::Card, icon_bitfield::IconBitfield};
struct OneIndexIterator {
n: u64,
offset: u8,
}
impl From<u64> for OneIndexIterator {
fn from(value: u64) -> Self {
Self {
n: value,
offset: 0,
}
}
}
impl Iterator for OneIndexIterator {
type Item = u8;
fn next(&mut self) -> Option<Self::Item> {
if self.n == 0 {
return None;
}
let new_offset = self.n.trailing_zeros() as u8;
self.n >>= new_offset + 1;
let result = self.offset + new_offset;
self.offset += new_offset + 1;
Some(result)
}
}
pub fn draw_painting(cards: &[Card], obj: &[(&CriteriaCard, u8)]) -> Option<[usize; 3]> {
let bitfields = cards.iter().map(IconBitfield::new).collect::<Vec<_>>();
let mut best: Option<([usize; 3], u8)> = None;
for stack in (0..cards.len()).permutations(3) {
let stack_indices: [_; 3] = stack.try_into().unwrap();
let stack = stack_indices.map(|x| cards[x]);
let maps = stack_indices.map(|x| &bitfields[x]);
let mut painting = maps[0].clone();
painting.layer_below(maps[1]).layer_below(maps[2]);
let criteria_points = obj
.iter()
.map(|(criteria, reached)| {
criteria.points.get(usize::from(
criteria.objective.count_matches_bitfield(&painting) + *reached,
))
})
.sum::<u8>();
let bonus_points = OneIndexIterator::from(u64::from(painting.get_point_bits()))
.map(|bit_index| {
let matched_icon = stack
.iter()
.map(|x| x.field_iter().nth(usize::from(bit_index)).unwrap())
.find_map(|x| match x {
CardField::PointsPer(icon) => Some(icon),
_ => None,
})
.expect("Point bits lied");
painting.get_icon_bits(matched_icon).count_ones() as u8 * 2
})
.sum::<u8>();
let total_points = bonus_points + criteria_points;
let stack_result = (stack_indices, total_points);
if let Some(bp) = &mut best {
if bp.1 < total_points {
*bp = stack_result;
}
} else {
best = Some(stack_result)
}
}
best.map(|x| x.0)
}
#[cfg(test)]
mod tests {
use crate::{card::Card, optimizer::draw_painting};
#[test]
fn test_basic() {
let cards = vec![
Card::from_dbg_string(".ttt."),
Card::from_dbg_string("t.l.."),
Card::from_dbg_string("ll..pt"),
];
assert_eq!(draw_painting(&cards, &[]), Some([0, 1, 2]));
}
}