From 97ff61495e5b7d68c82e238e266ba1a3c5f0a3e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20Charv=C3=A1t?= <jakcharvat@gmail.com>
Date: Fri, 6 Dec 2024 01:36:50 +0100
Subject: [PATCH] Day05

There's a recursive, dfs-based topsort implementation here that I'm pretty proud of
---
 day05/gleam.toml            |   20 +
 day05/input.txt             | 1381 +++++++++++++++++++++++++++++++++++
 day05/manifest.toml         |   14 +
 day05/small-in.txt          |   28 +
 day05/src/day05.gleam       |  110 +++
 day05/test/day05_test.gleam |   27 +
 6 files changed, 1580 insertions(+)
 create mode 100644 day05/gleam.toml
 create mode 100644 day05/input.txt
 create mode 100644 day05/manifest.toml
 create mode 100644 day05/small-in.txt
 create mode 100644 day05/src/day05.gleam
 create mode 100644 day05/test/day05_test.gleam

diff --git a/day05/gleam.toml b/day05/gleam.toml
new file mode 100644
index 0000000..1730560
--- /dev/null
+++ b/day05/gleam.toml
@@ -0,0 +1,20 @@
+name = "day05"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "", repo = "" }
+# links = [{ title = "Website", href = "" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/.
+
+[dependencies]
+gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+simplifile = ">= 2.2.0 and < 3.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"
diff --git a/day05/input.txt b/day05/input.txt
new file mode 100644
index 0000000..6b5aa61
--- /dev/null
+++ b/day05/input.txt
@@ -0,0 +1,1381 @@
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diff --git a/day05/manifest.toml b/day05/manifest.toml
new file mode 100644
index 0000000..207fe49
--- /dev/null
+++ b/day05/manifest.toml
@@ -0,0 +1,14 @@
+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "filepath", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "67A6D15FB39EEB69DD31F8C145BB5A421790581BD6AA14B33D64D5A55DBD6587" },
+  { name = "gleam_stdlib", version = "0.45.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "206FCE1A76974AECFC55AEBCD0217D59EDE4E408C016E2CFCCC8FF51278F186E" },
+  { name = "gleeunit", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "F7A7228925D3EE7D0813C922E062BFD6D7E9310F0BEE585D3A42F3307E3CFD13" },
+  { name = "simplifile", version = "2.2.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "0DFABEF7DC7A9E2FF4BB27B108034E60C81BEBFCB7AB816B9E7E18ED4503ACD8" },
+]
+
+[requirements]
+gleam_stdlib = { version = ">= 0.34.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }
+simplifile = { version = ">= 2.2.0 and < 3.0.0" }
diff --git a/day05/small-in.txt b/day05/small-in.txt
new file mode 100644
index 0000000..9d146d6
--- /dev/null
+++ b/day05/small-in.txt
@@ -0,0 +1,28 @@
+47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
+
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47
diff --git a/day05/src/day05.gleam b/day05/src/day05.gleam
new file mode 100644
index 0000000..118038a
--- /dev/null
+++ b/day05/src/day05.gleam
@@ -0,0 +1,110 @@
+import gleam/bool
+import gleam/int
+import gleam/io
+import gleam/list
+import gleam/result
+import gleam/set
+import gleam/string
+import simplifile
+
+type Reqs =
+  set.Set(#(Int, Int))
+
+fn force_unwrap(r: Result(a, e)) -> a {
+  result.lazy_unwrap(r, fn() { panic })
+}
+
+fn parse_int(s: String) -> Int {
+  int.parse(s) |> force_unwrap
+}
+
+fn make_requirements(lines: List(String)) -> Reqs {
+  lines
+  |> list.map(fn(line) {
+    let assert [left, right] = string.split(line, "|") |> list.map(parse_int)
+    #(left, right)
+  })
+  |> set.from_list
+}
+
+fn check_update(update: List(Int), reqs: Reqs) -> Bool {
+  list.combination_pairs(update)
+  |> list.all(fn(p) { !set.contains(reqs, #(p.1, p.0)) })
+}
+
+fn middle_element(l: List(a)) -> a {
+  let len = list.length(l)
+  use <- bool.lazy_guard(len % 2 == 1, otherwise: fn() { panic })
+
+  let mid = len / 2
+  list.drop(l, mid) |> list.first |> force_unwrap
+}
+
+type Input {
+  Input(reqs: Reqs, good: List(List(Int)), bad: List(List(Int)))
+}
+
+fn parse_input(input: String) -> Input {
+  let assert [rules, updates] =
+    input
+    |> string.split("\n\n")
+    |> list.map(string.split(_, "\n"))
+
+  let reqs = make_requirements(rules)
+
+  let #(good, bad) =
+    updates
+    |> list.map(fn(update) { string.split(update, ",") |> list.map(parse_int) })
+    |> list.partition(check_update(_, reqs))
+
+  Input(reqs, good, bad)
+}
+
+pub fn part1(input: String) -> Int {
+  parse_input(input).good
+  |> list.map(middle_element)
+  |> int.sum
+}
+
+type Acc {
+  Acc(res: List(Int), seen: set.Set(Int))
+}
+
+// Recursive, dfs-based topsort 🤯
+fn rec(update: List(Int), reqs: Reqs, curr_node: Int, acc: Acc) {
+  use <- bool.guard(set.contains(acc.seen, curr_node), return: acc)
+  let acc = Acc(..acc, seen: set.insert(acc.seen, curr_node))
+
+  let acc =
+    list.fold(update, acc, fn(acc, neigh) {
+      use <- bool.guard(set.contains(reqs, #(neigh, curr_node)), return: acc)
+      rec(update, reqs, neigh, acc)
+    })
+
+  Acc(..acc, res: [curr_node, ..acc.res])
+}
+
+fn reorder_update(update: List(Int), reqs: Reqs) -> List(Int) {
+  list.fold(update, Acc([], set.new()), fn(acc, curr) {
+    use <- bool.guard(set.contains(acc.seen, curr), return: acc)
+    rec(update, reqs, curr, acc)
+  }).res
+}
+
+pub fn part2(input: String) -> Int {
+  let Input(reqs, _, bad) = parse_input(input)
+  bad
+  |> list.map(reorder_update(_, reqs))
+  |> list.map(middle_element)
+  |> int.sum
+}
+
+pub fn main() {
+  let input =
+    simplifile.read("input.txt")
+    |> result.lazy_unwrap(fn() { panic })
+    |> string.trim
+
+  io.println("Part 1: " <> string.inspect(part1(input)))
+  io.println("Part 2: " <> string.inspect(part2(input)))
+}
diff --git a/day05/test/day05_test.gleam b/day05/test/day05_test.gleam
new file mode 100644
index 0000000..32a5056
--- /dev/null
+++ b/day05/test/day05_test.gleam
@@ -0,0 +1,27 @@
+import gleam/result
+import gleam/string
+import gleeunit
+import gleeunit/should
+import simplifile
+
+import day05
+
+fn input() -> String {
+  simplifile.read("small-in.txt")
+  |> result.lazy_unwrap(fn() { panic })
+  |> string.trim
+}
+
+pub fn main() {
+  gleeunit.main()
+}
+
+pub fn part1_test() {
+  day05.part1(input())
+  |> should.equal(143)
+}
+
+pub fn part2_test() {
+  day05.part2(input())
+  |> should.equal(123)
+}