Completed day 16

Not the prettiest code ever, but I don't feel like refactoring.

day16/Cargo.lock

@@ -0,0 +1,14 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c0df63cb2955042487fad3aefd2c6e3ae7389ac5dc1beb28921de0b69f779d4"
+
+[[package]]
+name = "day16"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+]

day16/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day16"
+version = "0.1.0"
+authors = ["Tyler Hallada <tyler@hallada.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0"

day16/input/input.txt

@@ -0,0 +1,266 @@
+departure location: 49-258 or 268-960
+departure station: 37-117 or 128-968
+departure platform: 31-70 or 78-974
+departure track: 26-234 or 247-952
+departure date: 49-625 or 635-969
+departure time: 26-777 or 799-974
+arrival location: 49-735 or 757-971
+arrival station: 28-381 or 399-970
+arrival platform: 49-77 or 95-957
+arrival track: 29-467 or 477-950
+class: 40-218 or 234-967
+duration: 45-900 or 911-970
+price: 42-442 or 452-966
+route: 45-104 or 112-953
+row: 49-877 or 884-957
+seat: 40-168 or 184-953
+train: 43-913 or 920-949
+type: 43-292 or 315-955
+wagon: 48-547 or 558-954
+zone: 40-929 or 935-954
+
+your ticket:
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+
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day16/input/test1.txt

@@ -0,0 +1,12 @@
+class: 1-3 or 5-7
+row: 6-11 or 33-44
+seat: 13-40 or 45-50
+
+your ticket:
+7,1,14
+
+nearby tickets:
+7,3,47
+40,4,50
+55,2,20
+38,6,12

day16/input/test2.txt

@@ -0,0 +1,11 @@
+class: 0-1 or 4-19
+row: 0-5 or 8-19
+seat: 0-13 or 16-19
+
+your ticket:
+11,12,13
+
+nearby tickets:
+3,9,18
+15,1,5
+5,14,9

day16/src/main.rs

@@ -0,0 +1,212 @@
+use anyhow::{Context, Error, Result};
+use std::collections::{HashMap, HashSet};
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::ops::RangeInclusive;
+use std::str::FromStr;
+use std::time::Instant;
+
+const INPUT: &str = "input/input.txt";
+
+#[derive(Debug)]
+struct Rule {
+    field: String,
+    ranges: (RangeInclusive<usize>, RangeInclusive<usize>),
+}
+
+type Ticket = Vec<usize>;
+
+impl FromStr for Rule {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self> {
+        let mut rule = s.split(": ");
+        let field = rule
+            .next()
+            .context("Failed to parse rule field name")?
+            .to_owned();
+        let ranges = rule.next().context("Failed to parse rule field name")?;
+        let mut ranges = ranges.split(" or ");
+        let range1 = ranges.next().context("Failed to parse rule first range")?;
+        let mut range1 = range1.split("-");
+        let range1 = RangeInclusive::new(
+            range1
+                .next()
+                .context("Failed to parse rule first range start")?
+                .parse()?,
+            range1
+                .next()
+                .context("Failed to parse rule first range end")?
+                .parse()?,
+        );
+        let range2 = ranges.next().context("Failed to parse rule second range")?;
+        let mut range2 = range2.split("-");
+        let range2 = RangeInclusive::new(
+            range2
+                .next()
+                .context("Failed to parse rule second range start")?
+                .parse()?,
+            range2
+                .next()
+                .context("Failed to parse rule second range end")?
+                .parse()?,
+        );
+        Ok(Self {
+            field,
+            ranges: (range1, range2),
+        })
+    }
+}
+
+impl Rule {
+    fn validate_num(&self, num: usize) -> bool {
+        self.ranges.0.contains(&num) || self.ranges.1.contains(&num)
+    }
+}
+
+fn validate_ticket(rules: &Vec<Rule>, ticket: &Ticket) -> bool {
+    ticket
+        .into_iter()
+        .all(|&num| rules.iter().any(|rule| rule.validate_num(num)))
+}
+
+fn solve_part1(input_path: &str) -> Result<usize> {
+    let file = File::open(input_path)?;
+    let reader = BufReader::new(file);
+    let mut lines = reader.lines();
+    let mut rules = Vec::new();
+    loop {
+        let line = lines.next().context("Unexpected end of input")??;
+        if line.is_empty() {
+            break;
+        } else {
+            rules.push(Rule::from_str(&line)?);
+        }
+    }
+    let nearby_tickets: Vec<Ticket> = lines
+        .skip(4)
+        .map(|line| {
+            Ok(line?
+                .split(",")
+                .map(|num| Ok(num.parse()?))
+                .collect::<Result<Ticket>>()?)
+        })
+        .collect::<Result<Vec<Ticket>>>()?;
+
+    Ok(nearby_tickets.iter().fold(0, |acc, ticket| {
+        if let Some(invalid_num) = ticket
+            .into_iter()
+            .find(|&num| !rules.iter().any(|rule| rule.validate_num(*num)))
+        {
+            acc + invalid_num
+        } else {
+            acc
+        }
+    }))
+}
+
+fn solve_part2(input_path: &str) -> Result<usize> {
+    let file = File::open(input_path)?;
+    let reader = BufReader::new(file);
+    let mut lines = reader.lines();
+    let mut rules = Vec::new();
+    loop {
+        let line = lines.next().context("Unexpected end of input")??;
+        if line.is_empty() {
+            break;
+        } else {
+            rules.push(Rule::from_str(&line)?);
+        }
+    }
+    let your_ticket: Ticket = lines
+        .by_ref()
+        .skip(1)
+        .next()
+        .context("Failed to parse your ticket")??
+        .split(",")
+        .map(|num| Ok(num.parse()?))
+        .collect::<Result<Ticket>>()?;
+    let mut tickets: Vec<Ticket> = lines
+        .skip(2)
+        .map(|line| {
+            Ok(line?
+                .split(",")
+                .map(|num| Ok(num.parse()?))
+                .collect::<Result<Ticket>>()?)
+        })
+        .collect::<Result<Vec<Ticket>>>()?;
+    tickets.push(your_ticket.clone());
+
+    // TODO: might be able to get rid of this extra iteration
+    let valid_tickets: Vec<Ticket> = tickets
+        .into_iter()
+        .filter(|ticket| validate_ticket(&rules, ticket))
+        .collect();
+
+    let mut rule_validations: HashMap<&str, HashMap<usize, usize>> = HashMap::new();
+    for ticket in valid_tickets.iter() {
+        for (i, num) in ticket.iter().enumerate() {
+            for rule in rules.iter() {
+                if rule.validate_num(*num) {
+                    let rule_entry = rule_validations
+                        .entry(&rule.field)
+                        .or_insert_with(|| HashMap::new());
+                    let validate_count = rule_entry.entry(i).or_insert(0);
+                    *validate_count += 1;
+                }
+            }
+        }
+    }
+
+    let mut rule_positions: HashMap<&str, &usize> = HashMap::new();
+    let mut assigned_positions = HashSet::new();
+    while rule_positions.len() != rules.len() {
+        for (field, validations) in rule_validations.iter() {
+            let possible_positions: Vec<(&usize, &usize)> = validations
+                .iter()
+                .filter(|&(position, count)| {
+                    count == &valid_tickets.len() && !assigned_positions.contains(&position)
+                })
+                .collect();
+            if possible_positions.len() == 1 {
+                let position = possible_positions.last().expect("count is 1").0;
+                rule_positions.insert(field, position);
+                assigned_positions.insert(position);
+            }
+        }
+    }
+
+    Ok([
+        "departure location",
+        "departure station",
+        "departure platform",
+        "departure track",
+        "departure date",
+        "departure time",
+    ]
+    .iter()
+    .map(|field| your_ticket[*rule_positions[field]])
+    .product())
+}
+
+fn main() {
+    let mut now = Instant::now();
+    println!("Part 1: {}", solve_part1(INPUT).unwrap());
+    println!("(elapsed: {:?})", now.elapsed());
+    now = Instant::now();
+    println!("");
+    println!("Part 2: {}", solve_part2(INPUT).unwrap());
+    println!("(elapsed: {:?})", now.elapsed());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TEST_INPUT1: &str = "input/test1.txt";
+
+    #[test]
+    fn solves_part1() {
+        assert_eq!(solve_part1(TEST_INPUT1).unwrap(), 71);
+    }
+}