day 16

data/day16/input

@@ -0,0 +1,263 @@
+departure location: 47-164 or 179-960
+departure station: 49-808 or 833-968
+departure platform: 50-561 or 567-964
+departure track: 29-407 or 416-954
+departure date: 48-317 or 339-965
+departure time: 42-366 or 390-952
+arrival location: 45-292 or 304-974
+arrival station: 26-255 or 266-951
+arrival platform: 47-225 or 243-957
+arrival track: 37-442 or 452-954
+class: 35-120 or 127-958
+duration: 47-642 or 659-972
+price: 39-509 or 535-962
+route: 47-705 or 729-962
+row: 49-480 or 494-959
+seat: 28-846 or 865-969
+train: 30-598 or 606-968
+type: 42-905 or 924-965
+wagon: 29-884 or 899-973
+zone: 39-790 or 803-969
+
+your ticket:
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+
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src/bin/day16.rs

@@ -0,0 +1,113 @@
+use std::ops::RangeInclusive;
+use std::collections::{HashSet, HashMap};
+
+const INPUT: &str = include_str!("../../data/day16/input");
+
+#[derive(Clone, Debug)]
+struct Field {
+    name: String,
+    ranges: Vec<RangeInclusive<u64>>,
+}
+
+impl Field {
+    fn matches(&self, value: u64) -> bool {
+        self.ranges.iter().any(|range| range.contains(&value))
+    }
+
+    fn parse(line: &str) -> Self {
+        let pos = line.find(": ").unwrap();
+        let name = line[..pos].to_string();
+        let ranges = line[pos+2..].split(" or ").map(|range| {
+            let pos = range.find("-").unwrap();
+            let start = range[..pos].parse().unwrap();
+            let end = range[pos+1..].parse().unwrap();
+            start..=end
+        }).collect();
+        Self { name, ranges }
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Ticket(Vec<u64>);
+
+impl Ticket {
+    fn invalid_values<'a>(&'a self, fields: &'a Vec<Field>) -> impl Iterator<Item=u64> + 'a {
+        self.0.iter().cloned().filter(move |&nr| {
+            !fields.iter().any(|field| field.matches(nr))
+        })
+    }
+
+    fn completely_invalid(&self, fields: &Vec<Field>) -> bool {
+        // at least one invalid value?
+        self.invalid_values(fields).next().is_some()
+    }
+
+    fn parse(line: &str) -> Self {
+        Self(line.split(",").map(|n| n.parse().unwrap()).collect())
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Input {
+    fields: Vec<Field>,
+    your_ticket: Ticket,
+    tickets: Vec<Ticket>,
+}
+
+impl Input {
+    fn parse(data: &str) -> Self {
+        let mut parts = data.split("\n\n");
+        let fields = parts.next().unwrap().lines().map(Field::parse).collect();
+        let your_ticket = Ticket::parse(
+            parts.next().unwrap().strip_prefix("your ticket:\n").unwrap()
+        );
+        let tickets = parts.next().unwrap()
+            .strip_prefix("nearby tickets:\n").unwrap()
+            .lines().map(|line| Ticket::parse(line))
+            .collect();
+        assert!(parts.next().is_none());
+        Self { fields, your_ticket, tickets }
+    }
+}
+
+fn main() {
+    let input = Input::parse(INPUT);
+    println!("Error rate: {}",
+        input.tickets.iter().map(|ticket| {
+            ticket.invalid_values(&input.fields)
+        }).flatten().sum::<u64>()
+    );
+    let nearby_tickets: Vec<_> = input.tickets.iter().filter(|ticket| {
+        !ticket.completely_invalid(&input.fields)
+    }).cloned().collect();
+    let mut field_columns = input.fields.iter().enumerate().map(|(ndx, field)| {
+        let columns = (0..input.fields.len()).filter(|&column| {
+            nearby_tickets.iter().all(|ticket| {
+                field.matches(ticket.0[column])
+            })
+        }).collect::<HashSet<usize>>();
+        (ndx, columns)
+    }).collect::<HashMap<usize, _>>();
+    let mut columns: HashMap<usize, usize> = HashMap::new();
+    let mut dep_product = 1;
+    while !field_columns.is_empty() {
+        let (ndx, col) = field_columns.iter().filter_map(|(ndx, set)| {
+            if set.len() == 1 {
+                Some((*ndx, *set.iter().next().unwrap()))
+            } else {
+                None
+            }
+        }).next().unwrap();
+        // println!("Possbile columns for fields: {:?}", field_columns);
+        // println!("Field [{:2} -> {:2}] {}: {}", ndx, col, input.fields[ndx].name, input.your_ticket.0[col]);
+        if input.fields[ndx].name.starts_with("departure") {
+            dep_product *= input.your_ticket.0[col];
+        }
+        field_columns.remove(&ndx);
+        columns.insert(ndx, col);
+        for col_set in field_columns.values_mut() {
+            col_set.remove(&col);
+        }
+    }
+    println!("Departure product: {}", dep_product);
+}