Browse Source

day1-4

master
Stefan Bühler 1 year ago
commit
493336905c
  1. 1
      .gitignore
  2. 5
      Cargo.lock
  3. 9
      Cargo.toml
  4. 200
      data/day1/input
  5. 1000
      data/day2/input
  6. 323
      data/day3/input
  7. 1146
      data/day4/input
  8. 35
      src/bin/day1/main.rs
  9. 69
      src/bin/day2/main.rs
  10. 65
      src/bin/day3/main.rs
  11. 13
      src/bin/day4/main.rs
  12. 106
      src/bin/day4/passport.rs

1
.gitignore

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/target

5
Cargo.lock

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "aoc2020"
version = "0.1.0"

9
Cargo.toml

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[package]
name = "aoc2020"
version = "0.1.0"
authors = ["Stefan Bühler <stbuehler@web.de>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

200
data/day1/input

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1000
data/day2/input

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323
data/day3/input

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1146
data/day4/input

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35
src/bin/day1/main.rs

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const INPUT: &str = include_str!("../../../data/day1/input");
fn main() {
let expenses: Vec<_> = INPUT.split_whitespace().map(|s| s.parse::<u32>().unwrap()).collect();
'outer: for (pos, &exp1) in expenses.iter().enumerate() {
for &exp2 in expenses[pos+1..].iter() {
if exp1 + exp2 == 2020 {
println!(
"Found: {exp1} + {exp2} = 2020; {exp1} * {exp2} = {}",
exp1 * exp2,
exp1 = exp1,
exp2 = exp2,
);
break 'outer;
}
}
}
'outer2: for (pos, &exp1) in expenses.iter().enumerate() {
for (pos2, &exp2) in expenses[pos+1..].iter().enumerate() {
for &exp3 in expenses[pos2+1..].iter() {
if exp1 + exp2 + exp3 == 2020 {
println!(
"Found: {exp1} + {exp2} + {exp3} = 2020; {exp1} * {exp2} * {exp3} = {}",
exp1 * exp2 * exp3,
exp1 = exp1,
exp2 = exp2,
exp3 = exp3,
);
break 'outer2;
}
}
}
}
}

69
src/bin/day2/main.rs

@ -0,0 +1,69 @@
use std::convert::TryInto;
const INPUT: &str = include_str!("../../../data/day2/input");
struct Policy {
min: usize,
max: usize,
chr: char,
}
impl Policy {
fn parse(text: &str) -> Self {
let tokens: Vec<_> = text.trim().split_whitespace().collect();
let [range, chr]: [&str; 2] = tokens.try_into().unwrap();
let tokens: Vec<_> = range.split("-").collect();
let [min, max]: [&str; 2] = tokens.try_into().unwrap();
assert!(chr.len() == 1);
let chr = chr.chars().next().unwrap();
let min = min.parse::<usize>().unwrap();
let max = max.parse::<usize>().unwrap();
Self { min, max, chr }
}
fn test(&self, input: &str) -> bool {
let count = input.chars().filter(|&c| c == self.chr).count();
count >= self.min && count <= self.max
}
fn test_crazy(&self, input: &str) -> bool {
let chars: Vec<_> = input.chars().collect();
assert!(self.min > 0 && self.max > 0);
assert!(self.min <= chars.len() && self.max <= chars.len());
(chars[self.min-1] == self.chr) != (chars[self.max-1] == self.chr)
}
}
struct Entry {
policy: Policy,
password: String,
}
impl Entry {
fn parse(line: &str) -> Self {
let tokens: Vec<_> = line.split(":").collect();
let [policy, password]: [&str; 2] = tokens.try_into().unwrap();
Self {
policy: Policy::parse(policy),
password: password.trim().into(),
}
}
fn parse_list(input: &str) -> Vec<Self> {
input.lines().map(Self::parse).collect()
}
fn valid(&self) -> bool {
self.policy.test(&self.password)
}
fn valid_crazy(&self) -> bool {
self.policy.test_crazy(&self.password)
}
}
fn main() {
let entries = Entry::parse_list(INPUT);
println!("Valid entries: {}", entries.iter().filter(|e| e.valid()).count());
println!("Crazy valid entries: {}", entries.iter().filter(|e| e.valid_crazy()).count());
}

65
src/bin/day3/main.rs

@ -0,0 +1,65 @@
const INPUT: &str = include_str!("../../../data/day3/input");
struct Forest {
pub rows: usize,
stride: usize,
trees: Vec<bool>,
}
impl Forest {
fn parse(text: &str) -> Self {
let first_line = text.lines().next().unwrap();
let stride = first_line.len();
let mut trees = Vec::new();
let mut rows = 0;
for line in text.lines() {
assert_eq!(line.len(), stride);
trees.extend(line.as_bytes().iter().map(|&c| c == b'#'));
rows += 1;
}
Self {
rows,
stride,
trees,
}
}
fn is_tree(&self, row: usize, column: u64) -> bool {
assert!(row < self.rows);
let column = (column % self.stride as u64) as usize;
self.trees[column + row * self.stride]
}
fn hit_trees(&self, slope_y: usize, slope_x: u64) -> u64 {
let mut row = slope_y;
let mut col = slope_x;
let mut hits = 0;
while row < self.rows {
if self.is_tree(row, col) {
hits += 1;
}
row += slope_y;
col += slope_x;
}
hits
}
}
const TEST_SLOPES: &[(usize, u64)] = &[
(1, 1),
(1, 3),
(1, 5),
(1, 7),
(2, 1),
];
fn main() {
let forest = Forest::parse(INPUT);
println!("Hit trees: {}", forest.hit_trees(1, 3));
println!(
"Hit product: {}",
TEST_SLOPES.iter().map(|(slope_y, slope_x)| {
forest.hit_trees(*slope_y, *slope_x)
}).product::<u64>(),
);
}

13
src/bin/day4/main.rs

@ -0,0 +1,13 @@
pub mod passport;
use passport::Passport;
const INPUT: &str = include_str!("../../../data/day4/input");
fn main() {
let passports = Passport::parse_list(INPUT);
let all_required_fields: Vec<_> = passports.iter().filter(|p| p.require_all_but_country_id()).collect();
println!("Required fields Passports: {}", all_required_fields.len());
let valid: Vec<_> = passports.iter().filter(|p| p.valid()).collect();
println!("Valid Passports: {}", valid.len());
}

106
src/bin/day4/passport.rs

@ -0,0 +1,106 @@
#[derive(Clone, Debug, Default)]
pub struct Passport {
// "byr": birth_year
pub birth_year: Option<String>,
// "iyr": issue_year
pub issue_year: Option<String>,
// "eyr": expiration_year
pub expiration_year: Option<String>,
// "hgt": height
pub height: Option<String>,
// "hcl": hair_color
pub hair_color: Option<String>,
// "ecl": eye_color
pub eye_color: Option<String>,
// "pid": passport_id
pub passport_id: Option<String>,
// "cid": country_id
pub country_id: Option<String>,
}
impl Passport {
pub fn parse(text: &str) -> Self {
let mut result = Self::default();
for token in text.split_whitespace() {
let colon = token.find(':').expect("missing separator");
let key = &token[..colon];
let value = &token[colon+1..];
match key {
"byr" => result.birth_year = Some(value.into()),
"iyr" => result.issue_year = Some(value.into()),
"eyr" => result.expiration_year = Some(value.into()),
"hgt" => result.height = Some(value.into()),
"hcl" => result.hair_color = Some(value.into()),
"ecl" => result.eye_color = Some(value.into()),
"pid" => result.passport_id = Some(value.into()),
"cid" => result.country_id = Some(value.into()),
_ => panic!("unknown field {:?}", key),
}
}
result
}
pub fn parse_list(text: &str) -> Vec<Self> {
text.split("\n\n").map(Self::parse).collect()
}
pub fn require_all_but_country_id(&self) -> bool {
self.birth_year.is_some() &
self.issue_year.is_some() &
self.expiration_year.is_some() &
self.height.is_some() &
self.hair_color.is_some() &
self.eye_color.is_some() &
self.passport_id.is_some()
}
fn _valid(&self) -> Option<()> {
let birth_year = self.birth_year.as_ref()?.parse::<u16>().ok()?;
if birth_year < 1920 || birth_year > 2002 {
return None;
}
let issue_year = self.issue_year.as_ref()?.parse::<u16>().ok()?;
if issue_year < 2010 || issue_year > 2020 {
return None;
}
let expiration_year = self.expiration_year.as_ref()?.parse::<u16>().ok()?;
if expiration_year < 2020 || expiration_year > 2030 {
return None;
}
let height = self.height.as_ref()?;
if height.ends_with("cm") {
let height = height[..height.len() - 2].parse::<u16>().ok()?;
if height < 150 || height > 193 {
return None;
}
} else if height.ends_with("in") {
let height = height[..height.len() - 2].parse::<u16>().ok()?;
if height < 59 || height > 76 {
return None;
}
} else {
return None;
}
let hair_color = self.hair_color.as_ref()?;
if !hair_color.starts_with("#") || hair_color.len() != 7 {
return None;
}
if !hair_color[1..].chars().all(|c| (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f')) {
return None;
}
let eye_color = self.eye_color.as_ref()?;
match eye_color.as_str() {
"amb"|"blu"|"brn"|"gry"|"grn"|"hzl"|"oth" => (),
_ => return None,
}
let passport_id = self.passport_id.as_ref()?;
if passport_id.len() != 9 || !passport_id.chars().all(|c| c.is_ascii_digit()) {
return None;
}
Some(())
}
pub fn valid(&self) -> bool {
self._valid().is_some()
}
}
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