From 493336905c7d265894267984c41ba0fc6ce8e8c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20B=C3=BChler?= <stbuehler@web.de>
Date: Fri, 4 Dec 2020 19:37:36 +0100
Subject: [PATCH] day1-4

---
 .gitignore               |    1 +
 Cargo.lock               |    5 +
 Cargo.toml               |    9 +
 data/day1/input          |  200 +++++++
 data/day2/input          | 1000 +++++++++++++++++++++++++++++++++
 data/day3/input          |  323 +++++++++++
 data/day4/input          | 1146 ++++++++++++++++++++++++++++++++++++++
 src/bin/day1/main.rs     |   35 ++
 src/bin/day2/main.rs     |   69 +++
 src/bin/day3/main.rs     |   65 +++
 src/bin/day4/main.rs     |   13 +
 src/bin/day4/passport.rs |  106 ++++
 12 files changed, 2972 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 data/day1/input
 create mode 100644 data/day2/input
 create mode 100644 data/day3/input
 create mode 100644 data/day4/input
 create mode 100644 src/bin/day1/main.rs
 create mode 100644 src/bin/day2/main.rs
 create mode 100644 src/bin/day3/main.rs
 create mode 100644 src/bin/day4/main.rs
 create mode 100644 src/bin/day4/passport.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a368233
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aoc2020"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..d162880
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[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]
diff --git a/data/day1/input b/data/day1/input
new file mode 100644
index 0000000..c9d1743
--- /dev/null
+++ b/data/day1/input
@@ -0,0 +1,200 @@
+1934
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diff --git a/data/day2/input b/data/day2/input
new file mode 100644
index 0000000..427015c
--- /dev/null
+++ b/data/day2/input
@@ -0,0 +1,1000 @@
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+pid:714110829 hgt:155cm cid:178
+
+cid:203 pid:455383907
+ecl:grn byr:1965
+hcl:#866857 eyr:2024 hgt:172cm iyr:2012
+
+iyr:2018 eyr:2033
+pid:462538213 byr:1974 hcl:#c0946f
+ecl:amb hgt:160cm
+
+hcl:#623a2f
+pid:116799148 cid:336
+ecl:grn eyr:2027
+iyr:2020
+byr:1976
+
+pid:654088396
+ecl:utc eyr:2021
+byr:2016
+hcl:#866857
+iyr:2030 hgt:191cm
+
+byr:1939
+eyr:2023
+iyr:2011 hgt:168cm
+cid:141 ecl:brn
+hcl:#6b5442
+
+eyr:2025 hgt:61in
+byr:1977
+ecl:brn iyr:2016 cid:198 pid:401742648
+
+ecl:brn
+iyr:2012 eyr:2027
+byr:1990 hcl:#6b5442
+pid:476691172
+hgt:72in
+
+cid:176 ecl:oth iyr:2011 hcl:#c0946f
+eyr:2028
+byr:1957 pid:959615191
+
+byr:2027
+iyr:2021 hcl:#733820 hgt:165cm pid:6155507056
+
+iyr:2012 ecl:blu
+pid:397461435 eyr:2022 byr:1993 hgt:170cm
+hcl:#b59662 cid:185
+
+ecl:hzl byr:2015
+hcl:z hgt:185cm eyr:2036 iyr:2017
+pid:172cm
+
+ecl:oth
+hgt:181cm iyr:2019
+cid:113 byr:2000
+hcl:#866857 pid:045077916 eyr:2029
+
+iyr:2013 ecl:grn
+pid:717028913 byr:1953 eyr:2025
+hgt:191cm hcl:#6b5442
+
+pid:825834003 eyr:2027 byr:1941
+hgt:163cm iyr:2010 hcl:#6b5442 ecl:amb
+
+eyr:2026 hgt:59in
+hcl:#e9ebf8 byr:1966
+iyr:2018 pid:677886127 ecl:grn
+
+hcl:#888785 pid:771218458 ecl:hzl eyr:2029
+cid:153 byr:1991 iyr:2011
+hgt:76in
+
+hgt:161cm hcl:#888785
+ecl:brn byr:1928 pid:913959218 eyr:2020 iyr:2013
+
+hgt:188cm eyr:2026
+byr:1964 ecl:blu hcl:#733820 iyr:2017 pid:874400552
+
+ecl:hzl iyr:2017
+cid:59 pid:130750853 byr:1964 eyr:2028 hgt:177cm hcl:#602927
+
+pid:200888672 ecl:oth iyr:2016 eyr:2020 hcl:#efcc98 hgt:163cm
+
+eyr:2026
+ecl:gry
+hgt:189cm
+hcl:#c0946f iyr:2019 pid:741121671 byr:1971
+
+ecl:amb eyr:2028 hcl:#888785 iyr:2017 pid:060053163 byr:1952 hgt:191cm
+
+hcl:#55c45a
+eyr:2022 ecl:blu
+iyr:2019 pid:326991534
+hgt:158cm
+cid:149
+
+hcl:#a97842 iyr:2013 ecl:hzl byr:1941 hgt:179cm
+
+hgt:68in hcl:#18171d
+eyr:2021 byr:1938 ecl:oth iyr:2015
+pid:888616887
+
+eyr:2026 iyr:2018 ecl:oth byr:1990
+hcl:#efcc98
+pid:472330538
+hgt:192cm
+
+byr:1933 ecl:grn hcl:#7d3b0c hgt:74in iyr:2011
+eyr:2028 cid:55
+
+iyr:2014 hgt:165cm ecl:blu hcl:#18171d byr:1998 pid:601177268 cid:64 eyr:2027
+
+iyr:2011 ecl:grn cid:188 pid:440822084 eyr:2028
+hcl:#c0946f byr:1987 hgt:154cm
+
+hcl:#f29c57
+cid:114 iyr:2010
+byr:1989 eyr:2023 hgt:61in
+pid:166071094
+
+hgt:71cm
+iyr:2022 byr:1965
+ecl:#bb3dce pid:88829820 eyr:2040 hcl:z
+
+hgt:62in hcl:#7d3b0c pid:585528668
+eyr:2028 ecl:oth
+byr:1941
+
+ecl:oth eyr:2030
+byr:1952
+iyr:2018 pid:422437243 hgt:185cm
+
+pid:054717793 byr:1989 hcl:#18171d
+iyr:2014
+ecl:grn
+eyr:2025 hgt:151cm
+
+eyr:2027
+hcl:#cfa07d pid:071196833
+cid:297 byr:1932 hgt:173in
+ecl:grn iyr:2016
+
+hcl:#6b1c3d eyr:2026 pid:963034490 iyr:2011
+hgt:175cm byr:1961 ecl:oth
+
+hgt:69in
+hcl:#b6652a ecl:oth
+pid:771661551 iyr:2016 eyr:2023 byr:1960
+
+cid:63
+pid:190cm byr:2021 ecl:#252d02 eyr:1931
+iyr:1966 hgt:101 hcl:dc9531
+
+byr:1976 eyr:1925
+ecl:grt cid:203
+iyr:2019
+pid:170cm hgt:181in
+
+iyr:2014 ecl:amb
+hgt:182cm cid:283 byr:1983
+pid:307867769 eyr:2024 hcl:#cfa07d
+
+hgt:157cm hcl:#ceb3a1 eyr:2026 pid:109243500
+byr:1926
+iyr:2015 ecl:oth cid:330
+
+hcl:#602927 byr:1940 pid:389818848
+iyr:2016 ecl:brn
+hgt:68in eyr:2023
+
+ecl:brn pid:340990019
+eyr:2020 iyr:2011
+hcl:#fffffd hgt:175cm byr:2001
+
+cid:264
+hgt:154cm pid:128094068
+hcl:#888785 iyr:2013 eyr:2027
+byr:1929 ecl:amb
+
+cid:270 hcl:#602927 hgt:156cm iyr:2018
+byr:1983
+eyr:2020 pid:621875145
+ecl:gry
+
+cid:345 pid:68093057 ecl:grt
+iyr:2019 byr:1992 hgt:109 hcl:35d6e4 eyr:1976
+
+pid:714839913 ecl:grn hcl:#733820 iyr:2020 hgt:153cm
+byr:1996 eyr:2027
+
+pid:820650878 eyr:2027
+hcl:#866857 byr:1957
+iyr:2015 ecl:grn hgt:167cm
+
+pid:600488426
+hcl:#ceb3a1 hgt:151cm
+ecl:amb eyr:2021 byr:1936 iyr:2015 cid:326
+
+cid:256 hgt:169cm
+iyr:2014
+pid:261369952 eyr:2028 byr:1982
+ecl:brn
+hcl:#733820
+
+eyr:2021 iyr:2011
+pid:745066100 hcl:#3bbbd5 byr:1998 ecl:amb hgt:166cm
+cid:257
+
+ecl:#a38be3 cid:256 hgt:154 eyr:2033
+byr:2006 pid:5154675209 hcl:z
+
+hgt:160cm cid:103 ecl:gry byr:2000 hcl:#a97842 eyr:2026 pid:528503931
+iyr:2010
+
+eyr:2025 cid:131 iyr:2011
+byr:2001
+pid:346722892
+hcl:#cc0362
+hgt:168cm
+ecl:brn
+
+hcl:#ceb3a1 iyr:2012
+hgt:188cm pid:760916817 byr:1985
+eyr:2020 ecl:oth
+
+hgt:179cm
+cid:317
+ecl:amb pid:411265118 iyr:2018
+byr:1982 hcl:#733820 eyr:2028
+
+byr:1927 hcl:#7d3b0c iyr:2020 ecl:gry
+hgt:155cm pid:937138356 eyr:2021
+
+hcl:#efcc98 pid:793804751 eyr:2022 byr:1961 hgt:193cm iyr:2016 cid:222
+
+pid:715207875 hcl:#18171d eyr:2030 byr:1974 hgt:157cm ecl:blu
+iyr:2019
+
+eyr:2022 pid:134624402 hgt:159cm cid:154
+byr:1938 hcl:#cfa07d
+iyr:2018 ecl:gry
+
+ecl:oth eyr:2021
+cid:259 pid:0484880795 hcl:#cfa07d hgt:189cm iyr:2019 byr:1958
+
+byr:1960
+pid:752967111 iyr:2010 hcl:#52a9af
+hgt:151cm ecl:amb eyr:2025
+
+eyr:2028 byr:1974 ecl:oth cid:348
+hcl:#b6652a hgt:164cm iyr:2018
+
+eyr:2029
+byr:1942 cid:232 iyr:2016 hgt:193cm
+hcl:#733820 pid:175cm ecl:oth
+
+byr:1990 hcl:#b6652a eyr:2028 iyr:2011 pid:054326137 hgt:153cm ecl:blu
+
+byr:1933
+pid:659875882 hgt:181cm
+eyr:2023 iyr:2012
+ecl:grn hcl:#18171d
+
+ecl:grn iyr:2019 hcl:#866857 byr:1946
+eyr:2023 hgt:193cm pid:494553757
+
+cid:331
+ecl:blu eyr:2021 hcl:#733820 hgt:174cm
+iyr:2010 byr:1950 pid:405416908
diff --git a/src/bin/day1/main.rs b/src/bin/day1/main.rs
new file mode 100644
index 0000000..8a95dfa
--- /dev/null
+++ b/src/bin/day1/main.rs
@@ -0,0 +1,35 @@
+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;
+				}
+			}
+		}
+	}
+}
diff --git a/src/bin/day2/main.rs b/src/bin/day2/main.rs
new file mode 100644
index 0000000..25d9ffe
--- /dev/null
+++ b/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());
+}
\ No newline at end of file
diff --git a/src/bin/day3/main.rs b/src/bin/day3/main.rs
new file mode 100644
index 0000000..473c3f5
--- /dev/null
+++ b/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>(),
+	);
+}
diff --git a/src/bin/day4/main.rs b/src/bin/day4/main.rs
new file mode 100644
index 0000000..cdc5545
--- /dev/null
+++ b/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());
+}
diff --git a/src/bin/day4/passport.rs b/src/bin/day4/passport.rs
new file mode 100644
index 0000000..174082e
--- /dev/null
+++ b/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()
+	}
+}