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44
Cargo.toml
View File

@ -3,10 +3,6 @@ name = "advent2021"
version = "0.1.0" version = "0.1.0"
edition = "2021" edition = "2021"
[profile.release]
lto = true
debug = 1
[[bin]] [[bin]]
name = "day1" name = "day1"
path = "src/day1.rs" path = "src/day1.rs"
@ -66,43 +62,3 @@ path = "src/day14.rs"
[[bin]] [[bin]]
name = "day15" name = "day15"
path = "src/day15.rs" path = "src/day15.rs"
[[bin]]
name = "day16"
path = "src/day16.rs"
[[bin]]
name = "day17"
path = "src/day17.rs"
[[bin]]
name = "day18"
path = "src/day18.rs"
[[bin]]
name = "day19"
path = "src/day19.rs"
[[bin]]
name = "day20"
path = "src/day20.rs"
[[bin]]
name = "day21"
path = "src/day21.rs"
[[bin]]
name = "day22"
path = "src/day22.rs"
[[bin]]
name = "day23"
path = "src/day23.rs"
[[bin]]
name = "day24"
path = "src/day24.rs"
[[bin]]
name = "day25"
path = "src/day25.rs"

1
inputs/day16.txt
View File

@ -1 +0,0 @@
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

100
inputs/day18.txt
View File

@ -1,100 +0,0 @@
[[[[7,1],[0,0]],[6,[8,2]]],[8,[3,8]]]
[[[3,6],[9,4]],[[[5,9],5],[8,0]]]
[[[2,2],2],[1,[[1,6],7]]]
[[[[0,9],7],[[3,2],8]],[6,[7,9]]]
[[[[4,1],6],[[7,6],[2,2]]],[[[1,1],9],4]]
[[[8,[3,7]],3],[[4,4],[[9,1],[3,5]]]]
[[4,[8,2]],[1,[0,5]]]
[8,[8,7]]
[[[[2,2],7],[3,[4,5]]],[[4,6],[[2,5],4]]]
[[[5,5],[[5,1],3]],[[2,[8,2]],[[6,9],[1,5]]]]
[0,7]
[[[[5,1],3],[8,[5,3]]],7]
[[5,[2,[0,6]]],[[[5,5],2],[9,[8,0]]]]
[[[[3,4],2],0],4]
[[[[5,3],[2,7]],6],[[4,0],[9,[7,2]]]]
[[[3,[2,5]],[3,3]],7]
[[[[5,1],1],[4,8]],[[5,[8,3]],2]]
[[4,[[8,1],[8,5]]],[[[4,1],0],6]]
[[[5,5],[5,9]],[0,[[6,8],[0,1]]]]
[4,[[[7,9],4],0]]
[[[[0,1],7],[[3,6],5]],[8,[5,[6,1]]]]
[[[7,7],[8,0]],[6,[8,[7,9]]]]
[[[9,2],1],6]
[[[4,4],[2,[5,0]]],[[[2,6],6],[5,[4,3]]]]
[[2,[[4,7],5]],1]
[[8,7],[[[2,0],7],[1,[0,3]]]]
[[9,[[9,3],[9,5]]],[[8,7],[[4,1],[6,5]]]]
[[3,4],[[9,4],5]]
[[5,[[8,3],5]],1]
[[0,[[9,0],[3,2]]],[2,[7,[5,1]]]]
[[9,[[9,5],[8,6]]],[[4,4],[[3,8],[1,6]]]]
[[[1,[5,2]],9],[[4,6],[3,[8,0]]]]
[[1,7],[[1,7],9]]
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[[[7,2],[[1,0],[5,6]]],[[[3,7],[8,9]],6]]
[[[[1,1],1],[[8,6],[9,8]]],[[[1,8],4],[8,9]]]
[[[8,9],0],3]
[[[1,7],[1,[3,9]]],[6,[0,[8,5]]]]
[[0,5],[6,5]]
[[[[6,8],[4,5]],[[7,4],6]],[[3,6],5]]
[[8,[[0,9],8]],[9,[7,[7,9]]]]
[0,[[[7,1],2],[[0,4],4]]]
[[0,[[9,1],5]],[1,4]]
[3,4]
[[[9,3],[1,3]],[[[4,8],3],[[1,3],[9,0]]]]
[[[[5,1],7],[[9,2],8]],[[[6,8],[5,4]],[0,1]]]
[8,[[1,[3,0]],[[7,9],4]]]
[[[6,4],[[2,9],[9,0]]],[7,[[0,0],3]]]
[[3,[[9,6],6]],2]
[[5,[[3,1],[7,5]]],[[[6,7],9],[[4,6],[5,2]]]]
[[[4,[6,5]],8],[[6,[8,0]],[[9,3],3]]]
[[[[4,9],[2,8]],9],[[[5,0],0],[[3,4],[2,8]]]]
[[3,[7,1]],[9,[[1,8],7]]]
[[9,1],[0,[[0,7],[7,1]]]]
[[7,[0,[7,6]]],[[[5,3],1],[6,[4,5]]]]
[8,[[[2,1],[6,9]],[[3,3],[4,6]]]]
[0,[7,[3,0]]]
[[[[1,6],3],[5,[8,0]]],[[[6,6],7],1]]
[[[7,[8,3]],3],[[[2,8],5],[0,[9,5]]]]
[[[[5,1],4],[[1,2],1]],7]
[[[3,[7,5]],7],3]
[[9,[6,[1,1]]],[[[4,1],[2,2]],[[9,5],[7,7]]]]
[2,7]
[[[9,[8,6]],[[9,0],[6,5]]],[[[6,7],5],[[7,7],[2,3]]]]
[[[0,[6,4]],2],[4,[7,[7,5]]]]
[[[[6,1],[9,1]],[[6,1],9]],[[2,6],0]]
[[0,[[1,8],[3,5]]],[4,[[8,2],[4,2]]]]
[[[[9,3],[4,2]],2],[[[2,1],[7,1]],[4,8]]]
[[[3,[0,2]],3],8]
[[[4,[4,9]],9],[[[4,4],5],9]]
[[[[8,2],7],9],[[[1,0],[3,8]],[[7,7],0]]]
[[[3,2],[9,7]],[[9,[8,2]],[[5,5],3]]]
[[[7,[3,1]],[[8,3],1]],[[[8,6],[7,0]],4]]
[[9,[[9,1],5]],[[4,[1,1]],2]]
[[[[7,4],[0,3]],7],[8,[6,[3,3]]]]
[5,5]
[[6,7],[1,[7,[8,1]]]]
[[1,[0,4]],7]
[[[4,0],[[0,1],[2,2]]],[9,[[9,9],[3,0]]]]
[[[6,0],[[8,6],3]],[[5,1],[[8,1],[2,7]]]]
[[[[8,3],7],5],[9,[[5,1],8]]]
[[[[4,0],[5,2]],[[0,0],7]],2]
[[[[0,1],6],2],[[8,2],6]]
[[[[2,4],1],[[6,7],9]],[[[1,6],9],3]]
[[5,5],[[8,[7,7]],[5,8]]]
[[6,[[9,2],[9,7]]],[[[8,5],[4,4]],7]]
[[[9,[7,7]],[6,0]],[7,[[8,7],[1,2]]]]
[[7,[6,2]],[[9,[5,2]],[1,4]]]
[[[7,[5,9]],[[3,9],[4,5]]],[0,6]]
[[9,[8,[2,2]]],[[9,7],[1,1]]]
[[[[2,3],4],[[4,8],9]],[[9,[8,6]],[[0,9],0]]]
[[0,[[9,3],0]],[8,8]]
[[[[2,9],6],[[2,8],9]],[[[0,5],6],[[6,1],7]]]
[[9,[[8,3],[5,8]]],[[7,[3,0]],3]]
[[[4,[4,2]],0],1]
[[[[9,6],[5,8]],[6,2]],[[[8,0],[7,0]],[[5,6],4]]]
[[[8,0],[[4,3],[7,4]]],[[3,[7,9]],[[7,3],6]]]
[[3,[5,[0,3]]],[5,4]]
[[[[1,2],[6,3]],1],[[7,[5,2]],[[8,8],7]]]
[[4,[[8,0],[7,1]]],[[8,[8,0]],[[1,5],3]]]

718
inputs/day19.txt
View File

@ -1,718 +0,0 @@
--- scanner 0 ---
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--- scanner 1 ---
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--- scanner 2 ---
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--- scanner 3 ---
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26,-50,57
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--- scanner 4 ---
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--- scanner 5 ---
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--- scanner 6 ---
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--- scanner 7 ---
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--- scanner 8 ---
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--- scanner 9 ---
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--- scanner 10 ---
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--- scanner 11 ---
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--- scanner 12 ---
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--- scanner 13 ---
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--- scanner 14 ---
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--- scanner 15 ---
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--- scanner 16 ---
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--- scanner 17 ---
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--- scanner 18 ---
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--- scanner 19 ---
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--- scanner 20 ---
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--- scanner 21 ---
533,-731,630
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508,-638,-686
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698,631,500
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603,719,-634
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--- scanner 22 ---
62,5,12
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479,-656,617
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538,-721,649
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718,808,-445
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427,-637,750
522,471,500
935,-636,-380
894,-652,-474
430,539,380
--- scanner 23 ---
584,-628,701
687,619,544
509,-313,-531
429,-353,-579
591,-369,-560
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573,710,600
758,612,-498
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-661,-423,532
664,514,-561
586,-630,612
475,-635,539
-637,669,546
826,552,-655
39,30,-173
--- scanner 24 ---
-403,-570,-427
835,-850,759
-354,587,-617
618,567,574
-509,-951,874
647,-674,-595
638,706,-432
563,799,-377
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673,679,471
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877,-889,712
101,27,2
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783,-755,-598
815,-804,646
-335,735,-735
-454,-675,-562
-481,-825,852
-281,654,798
--- scanner 25 ---
483,-365,519
562,-828,-670
93,27,-47
-415,786,411
664,518,-347
883,371,601
-574,548,-810
904,504,742
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487,-526,567
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829,477,-412
718,454,-490
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-446,-560,-430
-371,-487,-404
639,-791,-711
-483,-706,741
604,-431,547
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862,441,742

102
inputs/day20.txt
View File

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2
inputs/day21.txt
View File

@ -1,2 +0,0 @@
Player 1 starting position: 8
Player 2 starting position: 7

420
inputs/day22.txt
View File

@ -1,420 +0,0 @@
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5
inputs/day23.txt
View File

@ -1,5 +0,0 @@
#############
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252
inputs/day24.txt
View File

@ -1,252 +0,0 @@
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137
inputs/day25.txt
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283
src/day16.rs
View File

@ -1,283 +0,0 @@
use std::num::ParseIntError;
use std::str::FromStr;
#[derive(PartialEq, Clone, Debug)]
enum PacketPayload {
Literal(u64),
Operator(u32, Vec<Packet>),
}
#[derive(Clone, Debug)]
struct Packet {
version: u32,
payload: PacketPayload,
}
impl PartialEq for Packet {
fn eq(&self, other: &Self) -> bool {
self.version == other.version && self.payload == other.payload
}
}
type ParsePacketResult = Result<Packet, ParseIntError>;
struct PacketParser<'a> {
s: std::str::Chars<'a>,
}
impl PacketParser<'_> {
fn new(s: &str) -> PacketParser {
PacketParser { s: s.chars() }
}
fn take_string(&mut self, n: usize) -> String {
(&mut self.s).take(n).collect()
}
fn parse_number(&mut self, bits: usize) -> Result<u32, ParseIntError> {
u32::from_str_radix(&self.take_string(bits), 2)
}
fn parse_operator(&mut self, id: u32) -> PacketPayload {
let mut packets;
match self.parse_number(1).unwrap() {
0 => {
let len = self.parse_number(15).unwrap() as usize;
let substring = self.take_string(len);
let sub_parser = &mut PacketParser::new(&substring);
packets = Vec::new();
while let Ok(packet) = sub_parser.parse_packet() {
packets.push(packet);
}
}
1 => {
let n = self.parse_number(11).unwrap();
packets = Vec::with_capacity(n as usize);
for _ in 0..n {
packets.push(self.parse_packet().unwrap());
}
}
_ => unreachable!(),
}
PacketPayload::Operator(id, packets)
}
fn parse_literal(&mut self) -> PacketPayload {
let mut n = 0_u64;
loop {
let first_bit = self.s.next().unwrap();
n = (n << 1) + self.s.next().unwrap().to_digit(2).unwrap() as u64;
n = (n << 1) + self.s.next().unwrap().to_digit(2).unwrap() as u64;
n = (n << 1) + self.s.next().unwrap().to_digit(2).unwrap() as u64;
n = (n << 1) + self.s.next().unwrap().to_digit(2).unwrap() as u64;
if first_bit == '0' {
break;
}
}
PacketPayload::Literal(n)
}
fn parse_packet(&mut self) -> ParsePacketResult {
let version = self.parse_number(3)?;
let payload = match self.parse_number(3)? {
4 => self.parse_literal(),
id => self.parse_operator(id),
};
Ok(Packet { version, payload })
}
}
impl FromStr for Packet {
type Err = ParseIntError;
fn from_str(s: &str) -> ParsePacketResult {
let s = s
.chars()
.map(|c| c.to_digit(16).unwrap())
.map(|n| format!("{:04b}", n))
.collect::<String>();
let mut parser = PacketParser::new(&s);
parser.parse_packet()
}
}
fn sum_version_numbers(p: &Packet) -> u32 {
match &p.payload {
PacketPayload::Literal(_) => p.version as u32,
PacketPayload::Operator(_, subpackets) => {
p.version + subpackets.iter().map(sum_version_numbers).sum::<u32>()
}
}
}
fn eval_packet(p: &Packet) -> u64 {
match &p.payload {
PacketPayload::Literal(n) => *n as u64,
PacketPayload::Operator(id, subpackets) => match id {
0 => subpackets.iter().map(eval_packet).sum::<u64>(),
1 => subpackets.iter().map(eval_packet).product::<u64>(),
2 => subpackets.iter().map(eval_packet).min().unwrap(),
3 => subpackets.iter().map(eval_packet).max().unwrap(),
5 => {
assert_eq!(subpackets.len(), 2);
if eval_packet(&subpackets[0]) > eval_packet(&subpackets[1]) {
1
} else {
0
}
}
6 => {
assert_eq!(subpackets.len(), 2);
if eval_packet(&subpackets[0]) < eval_packet(&subpackets[1]) {
1
} else {
0
}
}
7 => {
assert_eq!(subpackets.len(), 2);
if eval_packet(&subpackets[0]) == eval_packet(&subpackets[1]) {
1
} else {
0
}
}
_ => panic!("invalid operator ID {}", id),
},
}
}
fn main() -> Result<(), ParseIntError> {
let input = include_str!("../inputs/day16.txt").trim_end();
let packet: Packet = input.parse()?;
println!("solution {}", sum_version_numbers(&packet));
println!("solution {}", eval_packet(&packet));
Ok(())
}
#[test]
fn test_literal() {
let packet: Packet = "D2FE28".parse().unwrap();
assert_eq!(
packet,
Packet {
version: 6,
payload: PacketPayload::Literal(2021)
}
);
}
#[test]
fn test_parse_type_0_operator() {
let packet: Packet = "38006F45291200".parse().unwrap();
let packets = vec![
Packet {
version: 6,
payload: PacketPayload::Literal(10),
},
Packet {
version: 2,
payload: PacketPayload::Literal(20),
},
];
assert_eq!(
packet,
Packet {
version: 1,
payload: PacketPayload::Operator(6, packets)
}
);
}
#[test]
fn test_parse_type_1_operator() {
let packet: Packet = "EE00D40C823060".parse().unwrap();
assert_eq!(
packet,
Packet {
version: 7,
payload: PacketPayload::Operator(
3,
vec![
Packet {
version: 2,
payload: PacketPayload::Literal(1)
},
Packet {
version: 4,
payload: PacketPayload::Literal(2)
},
Packet {
version: 1,
payload: PacketPayload::Literal(3)
},
]
)
}
);
}
#[test]
fn test_sum_version_numbers() {
let transmissions = [
"8A004A801A8002F478",
"620080001611562C8802118E34",
"C0015000016115A2E0802F182340",
"A0016C880162017C3686B18A3D4780",
];
let mut iter = transmissions
.iter()
.map(|t| sum_version_numbers(&t.parse().unwrap()));
assert_eq!(iter.next(), Some(16));
assert_eq!(iter.next(), Some(12));
assert_eq!(iter.next(), Some(23));
assert_eq!(iter.next(), Some(31));
}
#[test]
fn test_sum_operator() {
let packet: Packet = "C200B40A82".parse().unwrap();
assert_eq!(eval_packet(&packet), 3);
}
#[test]
fn test_product_operator() {
let packet: Packet = "04005AC33890".parse().unwrap();
assert_eq!(eval_packet(&packet), 54);
}
#[test]
fn test_minimum_operator() {
let packet: Packet = "880086C3E88112".parse().unwrap();
assert_eq!(eval_packet(&packet), 7);
}
#[test]
fn test_maximum_operator() {
let packet: Packet = "CE00C43D881120".parse().unwrap();
assert_eq!(eval_packet(&packet), 9);
}
#[test]
fn test_less_than_operator() {
let packet: Packet = "D8005AC2A8F0".parse().unwrap();
assert_eq!(eval_packet(&packet), 1);
}
#[test]
fn test_greater_than_operator() {
let packet: Packet = "F600BC2D8F".parse().unwrap();
assert_eq!(eval_packet(&packet), 0);
}
#[test]
fn test_equal_operator() {
let packet: Packet = "9C005AC2F8F0".parse().unwrap();
assert_eq!(eval_packet(&packet), 0);
}
#[test]
fn test_nested_equal_operator() {
let packet: Packet = "9C0141080250320F1802104A08".parse().unwrap();
assert_eq!(eval_packet(&packet), 1);
}

111
src/day17.rs
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@ -1,111 +0,0 @@
use std::ops::RangeInclusive;
#[derive(Clone, Debug)]
struct Area {
x: RangeInclusive<i32>,
y: RangeInclusive<i32>,
}
impl Area {
fn contains(&self, x: i32, y: i32) -> bool {
self.x.contains(&x) && self.y.contains(&y)
}
}
fn simulate(area: &Area, dx: i32, dy: i32) -> Option<i32> {
let mut hit = false;
let mut max_y = 0;
for step in 0..1000 {
let x = if step < dx {
// General solution for $ x_{t+1} - x_t = -t - dx + 1 $.
((2 * dx + 1) * step - step * step) / 2
} else {
// Special case when $ x_{t+1} - x_t = 0 $ is reached.
(dx * dx + dx) / 2
};
let y = ((2 * dy + 1) * step - step * step) / 2;
if y > max_y {
max_y = y;
}
if area.contains(x, y) {
hit = true;
}
if y < *area.y.start() {
break;
}
}
hit.then(|| max_y)
}
fn find_max_y(area: Area) -> i32 {
let mut max_y = 0;
for dx in 1..=*area.x.end() {
for dy in 1..1000 {
if let Some(y) = simulate(&area, dx, dy) {
if y > max_y {
max_y = y;
}
}
}
}
max_y
}
fn count_hits(area: Area) -> i32 {
let mut counter = 0;
for dx in 1..=*area.x.end() {
for dy in *area.y.start()..1000 {
if simulate(&area, dx, dy).is_some() {
counter += 1;
}
}
}
counter
}
fn main() {
let area = Area {
x: (179..=201),
y: (-109..=-63),
};
println!("solution {}", find_max_y(area.clone()));
println!("solution {}", count_hits(area));
}
#[test]
fn test_find_max_y() {
assert_eq!(
find_max_y(Area {
x: (20..=30),
y: (-10..=-5)
}),
45
);
}
#[test]
fn test_simulate() {
let area = Area {
x: (20..=30),
y: (-10..=-5),
};
assert_eq!(simulate(&area, 7, 2), Some(3));
assert_eq!(simulate(&area, 6, 3), Some(6));
assert_eq!(simulate(&area, 17, -4), None);
assert_eq!(simulate(&area, 6, 9), Some(45));
}
#[test]
fn test_count_hits() {
assert_eq!(
count_hits(Area {
x: (20..=30),
y: (-10..=-5)
}),
112
);
}

242
src/day18.rs
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@ -1,242 +0,0 @@
use std::fmt;
use std::ops::Add;
use std::str::FromStr;
#[derive(Clone)]
enum Value {
Number(u32, usize),
Pair(Box<Value>, Box<Value>),
}
impl Value {
fn new_pair(left: Value, right: Value) -> Self {
Value::Pair(Box::new(left), Box::new(right))
}
}
impl Value {
fn is_number_pair(&self) -> bool {
match self {
Value::Pair(left, right) => left.is_number() && right.is_number(),
Value::Number(_, _) => false,
}
}
fn is_number(&self) -> bool {
matches!(*self, Value::Number(_, _))
}
fn number(&self) -> Option<u32> {
match self {
Self::Number(n, _) => Some(*n),
_ => None,
}
}
fn index(&self) -> Option<usize> {
match self {
Self::Number(_, i) => Some(*i),
_ => None,
}
}
fn add_number(&mut self, n: u32) {
if let Self::Number(m, i) = self {
*self = Value::Number(*m + n, *i);
}
}
}
impl Add for Value {
type Output = Self;
fn add(self, other: Self) -> Self {
let mut v = Value::new_pair(self, other);
reduce(&mut v);
v
}
}
fn parse_pair(iter: &mut std::iter::Peekable<std::str::Chars>) -> Value {
if iter.next().unwrap() != '[' {
panic!();
}
let left = match iter.peek().unwrap() {
'[' => parse_pair(iter),
'0'..='9' => Value::Number(iter.next().unwrap().to_digit(10).unwrap(), 0),
_ => panic!(),
};
if iter.next().unwrap() != ',' {
panic!();
}
let right = match iter.peek().unwrap() {
'[' => parse_pair(iter),
'0'..='9' => Value::Number(iter.next().unwrap().to_digit(10).unwrap(), 0),
_ => panic!(),
};
if iter.next().unwrap() != ']' {
panic!();
}
Value::new_pair(left, right)
}
impl FromStr for Value {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut v = parse_pair(&mut s.chars().peekable());
renumber(&mut v);
Ok(v)
}
}
impl fmt::Display for Value {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Value::Number(n, _) => write!(f, "{}", n),
Value::Pair(left, right) => write!(f, "[{},{}]", left, right),
}
}
}
fn find_exploded(tree: &Value, depth: usize) -> Option<&Value> {
if let Value::Pair(left, right) = tree {
if depth == 4 && tree.is_number_pair() {
Some(tree)
} else {
find_exploded(left, depth + 1).or_else(|| find_exploded(right, depth + 1))
}
} else {
None
}
}
fn find_number(tree: &mut Value, index: usize, n: u32) -> Option<&Value> {
match tree {
Value::Pair(left, right) => {
find_number(left, index, n).or_else(|| find_number(right, index, n))
}
Value::Number(_, i) if *i == index => {
tree.add_number(n);
Some(tree)
}
_ => None,
}
}
fn zero_pair(tree: &mut Value, index: usize) {
if let Value::Pair(left, right) = tree {
if let Value::Pair(ref n, _) = **left {
if let Value::Number(_, i) = **n {
if i == index {
*left = Box::new(Value::Number(0, 0));
return;
}
}
}
if let Value::Pair(ref n, _) = **right {
if let Value::Number(_, i) = **n {
if i == index {
*right = Box::new(Value::Number(0, 0));
return;
}
}
}
zero_pair(left, index);
zero_pair(right, index);
}
}
fn renumber_pair(value: &mut Value, counter: &mut usize) {
if let Value::Pair(left, right) = value {
renumber_pair(left.as_mut(), counter);
renumber_pair(right.as_mut(), counter);
}
if let Value::Number(n, _) = value {
*value = Value::Number(*n, *counter);
*counter += 1;
}
}
fn renumber(tree: &mut Value) {
let mut counter = 0;
renumber_pair(tree, &mut counter);
}
fn explode(tree: &mut Value) {
let exploded = &mut find_exploded(tree, 0);
if let Some(value) = exploded {
if let Value::Pair(left, right) = value {
let index = left.index().unwrap();
let left_n = left.number().unwrap();
let right_n = right.number().unwrap();
zero_pair(tree, index);
if index > 0 {
find_number(tree, index - 1, left_n);
}
find_number(tree, index + 2, right_n);
renumber(tree);
} else {
panic!();
}
}
}
fn reduce(value: &mut Value) -> &Value {
explode(value);
value
}
fn magnitude(value: Value) -> u64 {
match value {
Value::Number(n, _) => n as u64,
Value::Pair(left, right) => 3 * magnitude(*left) + 2 * magnitude(*right),
}
}
fn main() {
const INPUT: &str = include_str!("../inputs/day18.txt");
let reduced = INPUT
.lines()
.map(|line| line.parse().unwrap())
.reduce(|u: Value, v| u + v)
.unwrap();
println!("solution {}", magnitude(reduced));
}
#[test]
fn test_explode_left() {
let mut v: Value = "[[[[[9,8],1],2],3],4]".parse().unwrap();
assert_eq!(format!("{}", reduce(&mut v)), "[[[[0,9],2],3],4]");
}
#[test]
fn test_explode_right() {
let mut v: Value = "[7,[6,[5,[4,[3,2]]]]]".parse().unwrap();
assert_eq!(format!("{}", reduce(&mut v)), "[7,[6,[5,[7,0]]]]");
}
#[test]
fn test_explode_left_again() {
let mut v: Value = "[[6,[5,[4,[3,2]]]],1]".parse().unwrap();
assert_eq!(format!("{}", reduce(&mut v)), "[[6,[5,[7,0]]],3]");
}
#[test]
fn test_explode() {
let mut v: Value = "[[3,[2,[1,[7,3]]]],[6,[5,[4,[3,2]]]]]".parse().unwrap();
assert_eq!(
format!("{}", reduce(&mut v)),
"[[3,[2,[8,0]]],[9,[5,[4,[3,2]]]]]"
);
}
#[test]
fn test_magnitude() {
let v: Value = "[[[[8,7],[7,7]],[[8,6],[7,7]]],[[[0,7],[6,6]],[8,7]]]"
.parse()
.unwrap();
assert_eq!(magnitude(v), 3488);
}

32
src/day19.rs
View File

@ -1,32 +0,0 @@
use std::collections::HashSet;
use std::str::FromStr;
struct Report(i32, i32, i32);
impl FromStr for Report {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut iter = s.splitn(3, ',').map(|n| n.parse().unwrap());
let x = iter.next().unwrap();
let y = iter.next().unwrap();
let z = iter.next().unwrap();
Ok(Self(x, y, z))
}
}
fn make_diffs(reports: &Vec<Report>) -> HashSet<Report> {
let mut set = HashSet::new();
for (i, report) in reports.iter().enumerate() {}
set
}
fn main() {
const INPUT: &str = include_str!("../inputs/day19.txt");
let reports = INPUT
.split("\n\n")
.map(|scanner| scanner.lines().map(|line| line.parse().unwrap()).collect())
.collect::<Vec<Vec<Report>>>();
let diffs: Vec<HashSet<Report>> = reports.iter().map(make_diffs).collect();
println!("solution {}", diffs.len());
}

158
src/day20.rs
View File

@ -1,158 +0,0 @@
use std::fmt;
use std::str::FromStr;
#[derive(Clone)]
struct Image {
image: Vec<Vec<char>>,
algorithm: Vec<char>,
background: bool,
}
impl Image {
fn is_light(&self, x: i32, y: i32) -> bool {
if x < 1 || y < 1 || x as usize > self.image[0].len() || y as usize > self.image.len() {
return self.background;
}
match self.image[(y - 1) as usize][(x - 1) as usize] {
'#' => true,
'.' => false,
p => panic!("invalid pixel '{}'", p),
}
}
fn enhance(self) -> Self {
let image = (0..self.image.len() + 2)
.map(|y| {
(0..self.image[0].len() + 2)
.map(|x| {
let mut idx = 0;
if self.is_light(x as i32 - 1, y as i32 - 1) {
idx += 0x100;
}
if self.is_light(x as i32, y as i32 - 1) {
idx += 0x080;
}
if self.is_light(x as i32 + 1, y as i32 - 1) {
idx += 0x040;
}
if self.is_light(x as i32 - 1, y as i32) {
idx += 0x020;
}
if self.is_light(x as i32, y as i32) {
idx += 0x010;
}
if self.is_light(x as i32 + 1, y as i32) {
idx += 0x008;
}
if self.is_light(x as i32 - 1, y as i32 + 1) {
idx += 0x004;
}
if self.is_light(x as i32, y as i32 + 1) {
idx += 0x002;
}
if self.is_light(x as i32 + 1, y as i32 + 1) {
idx += 0x001;
}
self.algorithm[idx]
})
.collect()
})
.collect();
let background = if self.algorithm[0] == '#' {
!self.background
} else {
false
};
Image {
image,
algorithm: self.algorithm,
background,
}
}
fn light_pixels(self) -> usize {
let result = self.enhance().enhance();
result
.image
.iter()
.map(|row| row.iter().filter(|p| **p == '#').count())
.sum()
}
fn super_light_pixels(self) -> usize {
let mut image = self;
for _ in 0..50 {
image = image.enhance();
}
image
.image
.iter()
.map(|row| row.iter().filter(|p| **p == '#').count())
.sum()
}
}
impl FromStr for Image {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (algorithm, image) = s.split_once("\n\n").unwrap();
let algorithm = algorithm.chars().collect();
let image = image
.lines()
.map(|line| line.trim_end().chars().collect())
.collect();
Ok(Image {
image,
algorithm,
background: false,
})
}
}
impl fmt::Debug for Image {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
writeln!(
f,
"algorithm: {}\n",
self.algorithm.iter().collect::<String>()
)?;
for row in self.image.iter() {
writeln!(f, "{}", row.iter().collect::<String>())?;
}
Ok(())
}
}
fn main() {
const INPUT: &str = include_str!("../inputs/day20.txt");
let image: Image = INPUT.parse().unwrap();
println!("solution {}", image.clone().light_pixels());
println!("solution {}", image.super_light_pixels());
}
#[test]
fn test_light_pixels() {
const INPUT: &str = "..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
#..#.
#....
##..#
..#..
..###";
let image: Image = INPUT.parse().unwrap();
assert_eq!(image.light_pixels(), 35);
}
#[test]
fn test_super_light_pixels() {
const INPUT: &str = "..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
#..#.
#....
##..#
..#..
..###";
let image: Image = INPUT.parse().unwrap();
assert_eq!(image.super_light_pixels(), 3351);
}

122
src/day21.rs
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@ -1,122 +0,0 @@
use std::collections::HashMap;
struct DeterministicDice {
rolls: usize,
last: usize,
}
impl DeterministicDice {
fn new() -> DeterministicDice {
DeterministicDice { rolls: 0, last: 0 }
}
}
impl Iterator for DeterministicDice {
type Item = usize;
fn next(&mut self) -> Option<Self::Item> {
self.rolls += 3;
let x = self.last % 100 + 1;
let y = (self.last + 1) % 100 + 1;
let z = (self.last + 2) % 100 + 1;
self.last = z;
Some(x + y + z)
}
}
fn turns_to_win(positions: (usize, usize)) -> (usize, usize) {
let mut dice = DeterministicDice::new();
let mut positions = positions;
let mut scores = (0, 0);
loop {
positions.0 = (positions.0 + dice.next().unwrap() - 1) % 10 + 1;
scores.0 += positions.0;
if scores.0 >= 1000 {
return (dice.rolls, scores.1);
}
positions.1 = (positions.1 + dice.next().unwrap() - 1) % 10 + 1;
scores.1 += positions.1;
if scores.1 >= 1000 {
return (dice.rolls, scores.0);
}
}
}
fn simulate_universes(positions: (usize, usize)) -> usize {
type GameState = ((usize, usize), (usize, usize));
let mut games: HashMap<GameState, usize> = HashMap::new();
let mut wins = (0, 0);
games.insert(((positions.0 - 1, positions.1 - 1), (0, 0)), 1);
let dice_rolls = [
3, 4, 5, 4, 5, 6, 5, 6, 7, 4, 5, 6, 5, 6, 7, 6, 7, 8, 5, 6, 7, 6, 7, 8, 7, 8, 9,
];
loop {
if games.is_empty() {
break;
}
let mut next_turn = HashMap::new();
for ((positions, scores), count) in games {
for player1_dice in dice_rolls {
let player1_position = (positions.0 + player1_dice) % 10;
let player1_score = scores.0 + player1_position + 1;
if player1_score < 21 {
for player2_dice in dice_rolls {
let player2_position = (positions.1 + player2_dice) % 10;
let player2_score = scores.1 + player2_position + 1;
if player2_score < 21 {
let new_count = next_turn
.entry((
(player1_position, player2_position),
(player1_score, player2_score),
))
.or_insert(0);
*new_count += count;
} else {
wins.1 += count;
}
}
} else {
wins.0 += count;
}
}
}
games = next_turn;
}
if wins.0 > wins.1 {
wins.0
} else {
wins.1
}
}
fn main() {
const INPUT: &str = include_str!("../inputs/day21.txt");
let positions = INPUT
.lines()
.map(|line| line.rsplit_once(' ').unwrap().1.parse().unwrap())
.collect::<Vec<usize>>();
let (turns, losing_score) = turns_to_win((positions[0], positions[1]));
println!("solution: {}", turns * losing_score);
println!(
"solution: {}",
simulate_universes((positions[0], positions[1]))
);
}
#[test]
fn test_turns_to_win() {
let (turns, losing_score) = turns_to_win((4, 8));
assert_eq!(turns, 993);
assert_eq!(losing_score, 745);
}
#[test]
fn test_simulate_universes() {
assert_eq!(simulate_universes((4, 8)), 444356092776315);
}

198
src/day22.rs
View File

@ -1,198 +0,0 @@
use std::{ops::RangeInclusive, str::FromStr};
#[derive(Clone, Debug)]
struct Cuboid {
positive: bool,
x: RangeInclusive<i64>,
y: RangeInclusive<i64>,
z: RangeInclusive<i64>,
}
fn contains_range(a: &RangeInclusive<i64>, b: &RangeInclusive<i64>) -> bool {
b.start() >= a.start() && b.end() <= a.end()
}
impl Cuboid {
fn contains(&self, other: &Cuboid) -> bool {
contains_range(&self.x, &other.x)
&& contains_range(&self.y, &other.y)
&& contains_range(&self.z, &other.z)
}
fn volume(&self) -> u64 {
((self.x.end() + 1 - self.x.start())
* (self.y.end() + 1 - self.y.start())
* (self.z.end() + 1 - self.z.start())) as u64
}
}
impl FromStr for Cuboid {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let positive = match &s[0..3] {
"on " => true,
"off" => false,
_ => return Err(()),
};
let w = s.splitn(12, &['=', '.', ','][..]).collect::<Vec<&str>>();
let x = w[1].parse().unwrap()..=w[3].parse().unwrap();
let y = w[5].parse().unwrap()..=w[7].parse().unwrap();
let z = w[9].parse().unwrap()..=w[11].parse().unwrap();
Ok(Cuboid { positive, x, y, z })
}
}
#[derive(Debug)]
struct Segments {
inner: Vec<RangeInclusive<i64>>,
}
impl Segments {
fn new(ranges: &[RangeInclusive<i64>]) -> Segments {
let mut starts = ranges.iter().map(|r| *r.start()).collect::<Vec<i64>>();
starts.sort_unstable();
starts.dedup();
let mut starts_iter = starts.into_iter().peekable();
let mut ends = ranges.iter().map(|r| *r.end()).collect::<Vec<i64>>();
ends.sort_unstable();
ends.dedup();
let mut ends_iter = ends.into_iter().peekable();
let mut inner = Vec::new();
let mut start = starts_iter.next().unwrap();
while let Some(maybe_end) = ends_iter.peek() {
if maybe_end < &start {
ends_iter.next();
continue;
}
if let Some(maybe_start) = starts_iter.peek() {
if maybe_start <= &start {
starts_iter.next();
continue;
}
if maybe_start <= maybe_end {
let end = starts_iter.next().unwrap();
inner.push(start..=end - 1);
start = end;
} else {
let end = ends_iter.next().unwrap();
inner.push(start..=end);
start = end + 1;
}
} else {
let end = ends_iter.next().unwrap();
inner.push(start..=end);
start = end + 1;
}
}
Segments { inner }
}
}
fn reboot(steps: &[Cuboid]) -> u64 {
let x_segments = Segments::new(
&steps
.iter()
.map(|s| s.x.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let y_segments = Segments::new(
&steps
.iter()
.map(|s| s.y.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let z_segments = Segments::new(
&steps
.iter()
.map(|s| s.z.clone())
.collect::<Vec<RangeInclusive<i64>>>(),
);
let mut count = 0;
for x in x_segments.inner {
let mut cuboid = Cuboid {
positive: true,
x: x.clone(),
y: 0..=0,
z: 0..=0,
};
for y in &y_segments.inner {
cuboid.y.clone_from(y);
for z in &z_segments.inner {
cuboid.z.clone_from(z);
let mut on = false;
for step in steps.iter() {
if step.contains(&cuboid) {
on = step.positive;
}
}
if on {
count += cuboid.volume()
}
}
}
}
count
}
fn main() {
const INPUT: &str = include_str!("../inputs/day22.txt");
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
println!("solution {}", reboot(&steps[..20]));
println!("solution {}", reboot(&steps));
}
#[test]
fn test_example() {
const INPUT: &str = "on x=10..12,y=10..12,z=10..12
on x=11..13,y=11..13,z=11..13
off x=9..11,y=9..11,z=9..11
on x=10..10,y=10..10,z=10..10";
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
assert_eq!(reboot(&steps), 39);
}
#[test]
fn test_reboot() {
const INPUT: &str = "on x=-20..26,y=-36..17,z=-47..7
on x=-20..33,y=-21..23,z=-26..28
on x=-22..28,y=-29..23,z=-38..16
on x=-46..7,y=-6..46,z=-50..-1
on x=-49..1,y=-3..46,z=-24..28
on x=2..47,y=-22..22,z=-23..27
on x=-27..23,y=-28..26,z=-21..29
on x=-39..5,y=-6..47,z=-3..44
on x=-30..21,y=-8..43,z=-13..34
on x=-22..26,y=-27..20,z=-29..19
off x=-48..-32,y=26..41,z=-47..-37
on x=-12..35,y=6..50,z=-50..-2
off x=-48..-32,y=-32..-16,z=-15..-5
on x=-18..26,y=-33..15,z=-7..46
off x=-40..-22,y=-38..-28,z=23..41
on x=-16..35,y=-41..10,z=-47..6
off x=-32..-23,y=11..30,z=-14..3
on x=-49..-5,y=-3..45,z=-29..18
off x=18..30,y=-20..-8,z=-3..13
on x=-41..9,y=-7..43,z=-33..15
";
let steps = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Cuboid>>();
assert_eq!(reboot(&steps), 590784);
}

245
src/day23.rs
View File

@ -1,245 +0,0 @@
use std::cmp::Ordering;
use std::collections::{BinaryHeap, HashMap};
use std::fmt;
use std::hash::{Hash, Hasher};
#[derive(Copy, Clone, Eq)]
enum Space {
Empty = 1,
Amber,
Bronze,
Copper,
Desert,
}
impl Space {
fn cost(&self) -> usize {
match self {
Self::Amber => 1,
Self::Bronze => 10,
Self::Copper => 100,
Self::Desert => 1000,
_ => panic!("empty spaces don't move"),
}
}
fn glyph(&self) -> char {
match self {
Self::Empty => '.',
Self::Amber => 'A',
Self::Bronze => 'B',
Self::Copper => 'C',
Self::Desert => 'D',
}
}
}
impl Hash for Space {
fn hash<H: Hasher>(&self, state: &mut H) {
(*self as u32).hash(state);
}
}
impl PartialEq for Space {
fn eq(&self, other: &Self) -> bool {
*self as u32 == *other as u32
}
}
impl Ord for Space {
fn cmp(&self, other: &Self) -> Ordering {
(*other as u32).cmp(&(*self as u32))
}
}
impl PartialOrd for Space {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl fmt::Debug for Space {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.glyph())
}
}
#[derive(Copy, Clone, Eq, PartialEq)]
struct Step {
cost: usize,
position: [Space; 19],
}
impl Ord for Step {
fn cmp(&self, other: &Self) -> Ordering {
other
.cost
.cmp(&self.cost)
.then_with(|| self.position.cmp(&other.position))
}
}
impl PartialOrd for Step {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl fmt::Debug for Step {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
writeln!(f, "#############")?;
writeln!(
f,
"#{}#",
self.position[0..11]
.iter()
.map(|space| space.glyph())
.collect::<String>()
)?;
writeln!(
f,
"###{}#{}#{}#{}###",
self.position[11].glyph(),
self.position[13].glyph(),
self.position[15].glyph(),
self.position[17].glyph()
)?;
writeln!(
f,
" #{}#{}#{}#{}#",
self.position[12].glyph(),
self.position[14].glyph(),
self.position[16].glyph(),
self.position[18].glyph()
)?;
writeln!(f, " #########")
}
}
fn swap(position: [Space; 19], a: usize, b: usize) -> [Space; 19] {
let mut new_position = position;
new_position[a] = position[b];
new_position[b] = position[a];
new_position
}
struct Burrow {
goal: [Space; 19],
}
impl Burrow {
fn valid_moves(&self, position: [Space; 19]) -> Vec<([Space; 19], usize)> {
let mut moves = Vec::new();
for door in [2, 4, 6, 8] {
if position[door] != Space::Empty {
if position[door - 1] == Space::Empty {
moves.push((swap(position, door - 1, door), position[door].cost()));
}
if position[door + 1] == Space::Empty {
moves.push((swap(position, door, door + 1), position[door].cost()));
}
if !moves.is_empty() {
return moves;
}
}
}
for room in [11, 13, 15, 17] {
if position[room] != Space::Empty && position[room + 1] == Space::Empty {
moves.push((swap(position, room, room + 1), position[room].cost()));
}
if position[room + 1] != Space::Empty && position[room] == Space::Empty {
moves.push((swap(position, room, room + 1), position[room + 1].cost()));
}
if position[room] != Space::Empty && position[room - 9] == Space::Empty {
moves.push((swap(position, room, room - 9), position[room].cost()));
}
if (position[room - 9] != Space::Empty && position[room] == Space::Empty)
&& ((position[room - 9] == self.goal[room + 1]
&& position[room + 1] == Space::Empty)
|| (position[room - 9] == self.goal[room]
&& position[room + 1] == self.goal[room + 1]))
{
moves.push((swap(position, room - 9, room), position[room - 9].cost()));
}
}
for hallway in [1, 3, 5, 7, 9] {
if position[hallway] != Space::Empty {
if position[hallway - 1] == Space::Empty {
moves.push((
swap(position, hallway, hallway - 1),
position[hallway].cost(),
));
}
if position[hallway + 1] == Space::Empty {
moves.push((
swap(position, hallway, hallway + 1),
position[hallway].cost(),
));
}
}
}
if position[0] != Space::Empty && position[1] == Space::Empty {
moves.push((swap(position, 0, 1), position[0].cost()));
}
if position[10] != Space::Empty && position[9] == Space::Empty {
moves.push((swap(position, 9, 10), position[10].cost()));
}
moves
}
}
fn least_energy(start: &[Space; 19], goal: &[Space; 19]) -> Option<usize> {
let burrow = Burrow { goal: *goal };
let mut dist: HashMap<[Space; 19], usize> = HashMap::new();
let mut heap = BinaryHeap::new();
dist.insert(*start, 0);
heap.push(Step {
cost: 0,
position: *start,
});
while let Some(Step { cost, position }) = heap.pop() {
if &position == goal {
return Some(cost);
}
let d = dist.entry(position).or_insert(usize::MAX);
if &cost > d {
continue;
}
println!("{:?}", Step { cost, position });
let moves = burrow.valid_moves(position);
for (next_position, next_cost) in moves {
let next_cost = next_cost + cost;
let next = Step {
cost: next_cost,
position: next_position,
};
if &next_cost < dist.get(&next_position).unwrap_or(&usize::MAX) {
heap.push(next);
dist.insert(next_position, next_cost);
}
}
}
None
}
fn main() {
use Space::*;
let start = [
Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Amber, Amber,
Bronze, Bronze, Copper, Copper, Desert, Desert,
];
let goal = [
Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Empty, Desert,
Bronze, Desert, Amber, Copper, Amber, Bronze, Copper,
];
println!("solution {}", least_energy(&start, &goal).unwrap());
}

220
src/day24.rs
View File

@ -1,220 +0,0 @@
use std::str::FromStr;
#[derive(Copy, Clone)]
enum Operand {
W,
X,
Y,
Z,
Literal(i64),
}
impl FromStr for Operand {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"w" => Ok(Operand::W),
"x" => Ok(Operand::X),
"y" => Ok(Operand::Y),
"z" => Ok(Operand::Z),
_ => Ok(Operand::Literal(s.parse().unwrap())),
}
}
}
#[derive(Copy, Clone)]
enum Instruction {
Inp(Operand),
Add(Operand, Operand),
Mul(Operand, Operand),
Div(Operand, Operand),
Mod(Operand, Operand),
Eql(Operand, Operand),
}
impl FromStr for Instruction {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut iter = s.split_ascii_whitespace();
match iter.next().unwrap() {
"inp" => Ok(Instruction::Inp(iter.next().unwrap().parse().unwrap())),
"add" => Ok(Instruction::Add(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)),
"mul" => Ok(Instruction::Mul(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)),
"div" => Ok(Instruction::Div(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)),
"mod" => Ok(Instruction::Mod(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)),
"eql" => Ok(Instruction::Eql(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)),
_ => Err(()),
}
}
}
struct ArithmeticLogicUnit {
w: i64,
x: i64,
y: i64,
z: i64,
inputs: Vec<i64>,
}
impl ArithmeticLogicUnit {
fn new(inputs: &[i64]) -> ArithmeticLogicUnit {
ArithmeticLogicUnit {
w: 0,
x: 0,
y: 0,
z: 0,
inputs: inputs.to_vec(),
}
}
fn load(&self, register: Operand) -> i64 {
match register {
Operand::W => self.w,
Operand::X => self.x,
Operand::Y => self.y,
Operand::Z => self.z,
Operand::Literal(a) => a,
}
}
fn store(&mut self, register: Operand, value: i64) {
match register {
Operand::W => {
self.w = value;
}
Operand::X => {
self.x = value;
}
Operand::Y => {
self.y = value;
}
Operand::Z => {
self.z = value;
}
Operand::Literal(_) => panic!("can't store in literal"),
}
}
fn eval(&mut self, instruction: Instruction) {
match instruction {
Instruction::Inp(a) => {
let value = self.inputs.pop().unwrap();
self.store(a, value);
}
Instruction::Add(a, b) => {
let a_val = self.load(a);
let b = self.load(b);
self.store(a, a_val + b);
}
Instruction::Mul(a, b) => {
let a_val = self.load(a);
let b = self.load(b);
self.store(a, a_val * b);
}
Instruction::Div(a, b) => {
let a_val = self.load(a);
let b = self.load(b);
self.store(a, a_val / b);
}
Instruction::Mod(a, b) => {
let a_val = self.load(a);
let b = self.load(b);
self.store(a, a_val % b);
}
Instruction::Eql(a, b) => {
let a_val = self.load(a);
let b = self.load(b);
self.store(a, if a_val == b { 1 } else { 0 });
}
}
}
}
struct ModelNumber {
digits: [i64; 14],
}
impl ModelNumber {
fn new() -> ModelNumber {
ModelNumber { digits: [9; 14] }
}
}
impl Iterator for ModelNumber {
type Item = [i64; 14];
fn next(&mut self) -> Option<Self::Item> {
let mut i = 0;
loop {
self.digits[i] -= 1;
if self.digits[i] == 0 {
self.digits[i] = 9;
i += 1;
} else {
break;
}
}
Some(self.digits)
}
}
fn main() {
const INPUT: &str = include_str!("../inputs/day24.txt");
let instructions = INPUT
.lines()
.map(|line| line.parse().unwrap())
.collect::<Vec<Instruction>>();
let model_number = ModelNumber::new();
for digits in model_number {
let mut alu = ArithmeticLogicUnit::new(&digits);
for instruction in instructions.iter() {
alu.eval(*instruction);
}
if alu.z == 0 {
println!(
"solution {}",
digits
.iter()
.rev()
.map(|d| char::from_digit(*d as u32, 10).unwrap())
.collect::<String>()
);
break;
}
}
}
#[test]
fn test_negate() {
let mut alu = ArithmeticLogicUnit::new(&[42]);
alu.eval(Instruction::Inp(Operand::X));
alu.eval(Instruction::Mul(Operand::X, Operand::Literal(-1)));
assert_eq!(alu.x, -42);
}
#[test]
fn test_equals_triple() {
let mut alu = ArithmeticLogicUnit::new(&[12, 4]);
alu.eval(Instruction::Inp(Operand::Z));
alu.eval(Instruction::Inp(Operand::X));
alu.eval(Instruction::Mul(Operand::Z, Operand::Literal(3)));
alu.eval(Instruction::Eql(Operand::Z, Operand::X));
assert_eq!(alu.z, 1);
}

125
src/day25.rs
View File

@ -1,125 +0,0 @@
use std::fmt;
use std::str::FromStr;
#[derive(Copy, Clone, PartialEq)]
enum Herd {
East,
South,
}
struct SeaCucumberMap {
inner: Vec<Vec<Option<Herd>>>,
}
impl SeaCucumberMap {
fn stops_moving(&mut self) -> usize {
let mut steps = 0;
while self.step() {
steps += 1;
}
steps + 1
}
fn step(&mut self) -> bool {
let shifted: Vec<Vec<Option<Herd>>> =
(0..self.inner.len()).map(|i| self.shift_right(i)).collect();
let new_map = (0..self.inner.len())
.map(|i| self.shift_down(i, &shifted))
.collect();
let changed = self.inner != new_map;
self.inner = new_map;
changed
}
fn shift_right(&self, i: usize) -> Vec<Option<Herd>> {
let row = &self.inner[i];
let mut new_row = Vec::with_capacity(row.len());
for (i, loc) in row.iter().enumerate() {
let left = row[(i + row.len() - 1) % row.len()];
let right = row[(i + row.len() + 1) % row.len()];
new_row.push(match (left, loc, right) {
(Some(Herd::East), None, _) => left,
(_, Some(Herd::East), None) => None,
_ => *loc,
});
}
new_row
}
fn shift_down(&self, i: usize, shifted: &[Vec<Option<Herd>>]) -> Vec<Option<Herd>> {
let height = self.inner.len();
let row = &shifted[i];
let above_row = &shifted[(i + height - 1) % height];
let below_row = &shifted[(i + height + 1) % height];
let mut new_row = Vec::with_capacity(row.len());
for (above, (loc, below)) in above_row.iter().zip(row.iter().zip(below_row)) {
new_row.push(match (*above, *loc, below) {
(Some(Herd::South), None, _) => *above,
(_, Some(Herd::South), None) => None,
_ => *loc,
});
}
new_row
}
}
impl FromStr for SeaCucumberMap {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
let inner = s
.lines()
.map(|line| {
line.chars()
.map(|c| match c {
'>' => Some(Herd::East),
'v' => Some(Herd::South),
'.' => None,
_ => panic!(),
})
.collect()
})
.collect();
Ok(SeaCucumberMap { inner })
}
}
impl fmt::Debug for SeaCucumberMap {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for row in self.inner.iter() {
writeln!(
f,
"{}",
row.iter()
.map(|c| match c {
Some(Herd::East) => '>',
Some(Herd::South) => 'v',
None => '.',
})
.collect::<String>()
)?;
}
Ok(())
}
}
fn main() {
const INPUT: &str = include_str!("../inputs/day25.txt");
let mut map: SeaCucumberMap = INPUT.parse().unwrap();
println!("solution {}", map.stops_moving());
}
#[test]
fn test_stops_moving() {
const INPUT: &str = "v...>>.vv>
.vv>>.vv..
>>.>v>...v
>>v>>.>.v.
v>v.vv.v..
>.>>..v...
.vv..>.>v.
v.v..>>v.v
....v..v.>";
let mut map: SeaCucumberMap = INPUT.parse().unwrap();
assert_eq!(map.stops_moving(), 58);
}