From cab4e2974dfb386b9c67912f9bf61ea0aea3f64d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tristan=20Dani=C3=ABl=20Maat?= <tm@tlater.net>
Date: Sun, 6 Dec 2020 21:00:40 +0000
Subject: [PATCH] Complete day 6
---
day-6/.gitignore | 1 +
day-6/Cargo.lock | 78 ++
day-6/Cargo.toml | 10 +
day-6/input | 2087 +++++++++++++++++++++++++++++++++++++++++++++
day-6/src/main.rs | 137 +++
5 files changed, 2313 insertions(+)
create mode 100644 day-6/.gitignore
create mode 100644 day-6/Cargo.lock
create mode 100644 day-6/Cargo.toml
create mode 100644 day-6/input
create mode 100644 day-6/src/main.rs
diff --git a/day-6/.gitignore b/day-6/.gitignore
new file mode 100644
index 0000000..b83d222
--- /dev/null
+++ b/day-6/.gitignore
@@ -0,0 +1 @@
+/target/
diff --git a/day-6/Cargo.lock b/day-6/Cargo.lock
new file mode 100644
index 0000000..e508f5f
--- /dev/null
+++ b/day-6/Cargo.lock
@@ -0,0 +1,78 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day-6"
+version = "0.1.0"
+dependencies = [
+ "indoc",
+]
+
+[[package]]
+name = "indoc"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8"
+dependencies = [
+ "indoc-impl",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "indoc-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unindent",
+]
+
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8833e20724c24de12bbaba5ad230ea61c3eafb05b881c7c9d3cfe8638b187e68"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "unindent"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7"
diff --git a/day-6/Cargo.toml b/day-6/Cargo.toml
new file mode 100644
index 0000000..a253da5
--- /dev/null
+++ b/day-6/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "day-6"
+version = "0.1.0"
+authors = ["Tristan Daniël Maat <tm@tlater.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+indoc = "0.3"
diff --git a/day-6/input b/day-6/input
new file mode 100644
index 0000000..9745c0b
--- /dev/null
+++ b/day-6/input
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+
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+
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+
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+
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+irholckaveszf
+
+gypwufz
+agspwqmuyz
+yogwpzu
+
+c
+oc
diff --git a/day-6/src/main.rs b/day-6/src/main.rs
new file mode 100644
index 0000000..9035577
--- /dev/null
+++ b/day-6/src/main.rs
@@ -0,0 +1,137 @@
+use std::collections::HashSet;
+use std::fs;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+ let input = fs::read_to_string("input")?;
+
+ // Part 1
+ let groups = parse_groups(&input)?;
+ println!("{}", count_answers(&groups));
+
+ // Part 2
+ let groups = parse_group_individuals(&input)?;
+ println!("{}", count_individual_answers(&groups));
+
+ Ok(())
+}
+
+fn parse_groups(input: &str) -> Result<Vec<HashSet<char>>, String> {
+ input
+ .split("\n\n")
+ .map(|group| {
+ group
+ .chars()
+ .filter(|c| *c != '\n')
+ .map(|c| {
+ if c.is_alphabetic() {
+ Ok(c)
+ } else {
+ Err(format!("Invalid answer: {}", c))
+ }
+ })
+ .collect()
+ })
+ .collect()
+}
+
+fn count_answers(groups: &Vec<HashSet<char>>) -> usize {
+ groups.iter().map(|group| group.iter().count()).sum()
+}
+
+fn parse_group_individuals(input: &str) -> Result<Vec<Vec<HashSet<char>>>, String> {
+ input
+ .split("\n\n")
+ .map(|group| {
+ group
+ .lines()
+ .map(|individual| {
+ individual
+ .chars()
+ .map(|c| {
+ if c.is_alphabetic() {
+ Ok(c)
+ } else {
+ Err(format!("Invalid answer: {}", c))
+ }
+ })
+ .collect()
+ })
+ .collect()
+ })
+ .collect()
+}
+
+fn count_individual_answers(groups: &Vec<Vec<HashSet<char>>>) -> usize {
+ groups
+ .iter()
+ .map(|group| {
+ let mut iter = group.into_iter().cloned();
+ let first = iter.next().expect("Must have at least one element");
+
+ iter.fold(first, |cumulative, entry| {
+ cumulative.intersection(&entry).copied().collect()
+ })
+ .len()
+ })
+ .sum()
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use indoc::indoc;
+
+ #[test]
+ fn test_simple() -> Result<(), Box<dyn std::error::Error>> {
+ let input = indoc!(
+ "abc
+
+ a
+ b
+ c
+
+ ab
+ ac
+
+ a
+ a
+ a
+ a
+
+ b
+ "
+ );
+
+ let groups = parse_groups(input)?;
+ let counts = count_answers(&groups);
+ assert_eq!(counts, 11);
+ Ok(())
+ }
+
+ #[test]
+ fn test_simple2() -> Result<(), Box<dyn std::error::Error>> {
+ let input = indoc!(
+ "abc
+
+ a
+ b
+ c
+
+ ab
+ ac
+
+ a
+ a
+ a
+ a
+
+ b
+ "
+ );
+
+ let groups = parse_group_individuals(input)?;
+ let counts = count_individual_answers(&groups);
+ assert_eq!(counts, 6);
+ Ok(())
+ }
+}