From e4733f487a05ac3739d173ec557446cf5354767d Mon Sep 17 00:00:00 2001
From: kageru <kageru@encode.moe>
Date: Wed, 16 Dec 2020 11:56:24 +0100
Subject: [PATCH] Add 2020/16

---
 2020/inputs/day16     | 270 ++++++++++++++++++++++++++++++++++++++++++
 2020/src/bin/day16.rs | 150 +++++++++++++++++++++++
 2 files changed, 420 insertions(+)
 create mode 100644 2020/inputs/day16
 create mode 100644 2020/src/bin/day16.rs

diff --git a/2020/inputs/day16 b/2020/inputs/day16
new file mode 100644
index 0000000..8a6cb7a
--- /dev/null
+++ b/2020/inputs/day16
@@ -0,0 +1,270 @@
+departure location: 33-430 or 456-967
+departure station: 42-864 or 875-957
+departure platform: 42-805 or 821-968
+departure track: 34-74 or 93-967
+departure date: 40-399 or 417-955
+departure time: 30-774 or 797-950
+arrival location: 50-487 or 507-954
+arrival station: 34-693 or 718-956
+arrival platform: 42-729 or 751-959
+arrival track: 28-340 or 349-968
+class: 49-524 or 543-951
+duration: 40-372 or 397-951
+price: 48-922 or 939-951
+route: 33-642 or 666-960
+row: 39-238 or 255-973
+seat: 48-148 or 161-973
+train: 50-604 or 630-971
+type: 29-299 or 316-952
+wagon: 45-898 or 921-966
+zone: 34-188 or 212-959
+
+your ticket:
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+
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diff --git a/2020/src/bin/day16.rs b/2020/src/bin/day16.rs
new file mode 100644
index 0000000..d599faa
--- /dev/null
+++ b/2020/src/bin/day16.rs
@@ -0,0 +1,150 @@
+#![feature(test, str_split_once)]
+extern crate test;
+use aoc2020::common::*;
+use itertools::Itertools;
+use std::ops::RangeInclusive;
+use text_io::scan;
+
+#[derive(Debug, Clone, PartialEq)]
+struct Parsed {
+    rules:          Vec<Rule>,
+    my_ticket:      Ticket,
+    nearby_tickets: Vec<Ticket>,
+}
+
+#[derive(Debug, Clone, PartialEq)]
+struct Rule {
+    fieldname: String,
+    lower:     RangeInclusive<usize>,
+    upper:     RangeInclusive<usize>,
+}
+
+type Ticket = Vec<usize>;
+
+impl From<&str> for Rule {
+    fn from(s: &str) -> Self {
+        let name: String;
+        let lo1: usize;
+        let lo2: usize;
+        let hi1: usize;
+        let hi2: usize;
+        scan!(s.bytes() => "{}: {}-{} or {}-{}", name, lo1, hi1, lo2, hi2);
+        Rule {
+            fieldname: name,
+            lower:     lo1..=hi1,
+            upper:     lo2..=hi2,
+        }
+    }
+}
+
+fn read_input() -> String {
+    read_file(16)
+}
+
+fn parse_input(raw: &str) -> Parsed {
+    let (rules, my_ticket, nearby) = raw.split("\n\n").next_tuple().unwrap();
+    Parsed {
+        rules:          rules.lines().map_into().collect(),
+        my_ticket:      my_ticket
+            .split_once('\n')
+            .unwrap()
+            .1
+            .split(',')
+            .map(|n| n.parse().unwrap())
+            .collect(),
+        nearby_tickets: nearby
+            .lines()
+            .skip(1)
+            .map(|l| l.split(',').map(|n| n.parse().unwrap()).collect())
+            .collect(),
+    }
+}
+
+// Could be optimized by folding the ranges first to only have one lower and one upper (or even
+// just a single one if they’re continuous), but meh.
+fn part1(parsed: &Parsed) -> usize {
+    parsed
+        .nearby_tickets
+        .iter()
+        .flat_map(|i| i.iter())
+        .filter(|n| !parsed.rules.iter().any(|r| r.lower.contains(n) || r.upper.contains(n)))
+        .sum()
+}
+
+fn remove_invalid(parsed: &Parsed) -> Vec<&Ticket> {
+    parsed
+        .nearby_tickets
+        .iter()
+        .filter(|i| {
+            i.iter()
+                .all(|n| parsed.rules.iter().any(|r| r.lower.contains(n) || r.upper.contains(n)))
+        })
+        .collect()
+}
+
+fn part2(parsed: &Parsed, key: &str) -> usize {
+    let len = parsed.my_ticket.len();
+    let only_valid = remove_invalid(parsed);
+    let mut remaining_rules = parsed.rules.clone();
+    let mut rules = vec![None; len];
+    for i in (0..len).cycle() {
+        let at_index = only_valid.iter().map(|v| v[i]).collect_vec();
+        if let Some(rule) = remaining_rules
+            .iter()
+            .filter(|r| at_index.iter().all(|i| r.lower.contains(i) || r.upper.contains(i)))
+            .exactly_one()
+            .ok()
+            .cloned()
+        {
+            // there must be a better way
+            let index = remaining_rules.iter().position(|r| r == &rule).unwrap();
+            remaining_rules.swap_remove(index);
+            rules[i] = Some(rule);
+            if rules.iter().all(|r| r.is_some()) {
+                break;
+            }
+        }
+    }
+    rules
+        .into_iter()
+        .enumerate()
+        .filter_map(|(n, r)| r.filter(|r| r.fieldname.starts_with(key)).map(|_| parsed.my_ticket[n]))
+        .product()
+}
+
+fn main() {
+    let input = parse_input(&read_input());
+    println!("Part 1: {}", part1(&input));
+    println!("Part 2: {}", part2(&input, "departure"));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use aoc2020::*;
+    use paste::paste;
+    use test::black_box;
+
+    const TEST_INPUT: &str = "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";
+
+    #[bench]
+    fn bench_input_parsing(b: &mut test::Bencher) {
+        let raw = read_input();
+        b.iter(|| assert_eq!(parse_input(black_box(&raw)).rules.len(), 20));
+    }
+
+    test!(part1() == 71);
+    bench!(part1() == 26026);
+    bench!(part2("departure") == 1305243193339);
+}