From aa30306fdd7ed67274d0002c6e4bb6bc6ae1b2cc Mon Sep 17 00:00:00 2001
From: Pedro Correa <pedro8correa@gmail.com>
Date: Thu, 17 Apr 2025 15:04:56 -0300
Subject: [PATCH] :sparkles: (Gleam) aoc day 5

---
 input/day_05           | 1361 ++++++++++++++++++++++++++++++++++++++++
 input/day_05.test      |   28 +
 src/day_05.gleam       |  109 ++++
 test/day_05_test.gleam |   81 +++
 4 files changed, 1579 insertions(+)
 create mode 100644 input/day_05
 create mode 100644 input/day_05.test
 create mode 100644 src/day_05.gleam
 create mode 100644 test/day_05_test.gleam

diff --git a/input/day_05 b/input/day_05
new file mode 100644
index 0000000..2a0b9d3
--- /dev/null
+++ b/input/day_05
@@ -0,0 +1,1361 @@
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diff --git a/input/day_05.test b/input/day_05.test
new file mode 100644
index 0000000..9d146d6
--- /dev/null
+++ b/input/day_05.test
@@ -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/src/day_05.gleam b/src/day_05.gleam
new file mode 100644
index 0000000..46c109a
--- /dev/null
+++ b/src/day_05.gleam
@@ -0,0 +1,109 @@
+import gleam/dict.{type Dict}
+import gleam/int
+import gleam/list
+import gleam/result
+import gleam/string
+
+type DictRules =
+  Dict(String, List(String))
+
+type Cases =
+  List(List(String))
+
+fn parse_rules(rules: List(String), acc_dict: DictRules) -> DictRules {
+  case rules {
+    [] -> acc_dict
+    [rule, ..rest] -> {
+      let assert Ok(#(key, value)) = string.split_once(rule, on: "|")
+
+      let new_list_rules = case dict.get(acc_dict, key) {
+        Ok(allowed) -> [value, ..allowed]
+        Error(_) -> [value]
+      }
+
+      acc_dict
+      |> dict.insert(key, new_list_rules)
+      |> parse_rules(rest, _)
+    }
+  }
+}
+
+pub fn parse_input(input: String) -> #(DictRules, Cases) {
+  let assert Ok(#(rules, cases)) = string.split_once(input, on: "\n\n")
+
+  let parsed_rules =
+    rules
+    |> string.split(on: "\n")
+    |> parse_rules(dict.new())
+
+  let parsed_cases =
+    cases
+    |> string.split(on: "\n")
+    |> list.filter_map(with: fn(data) {
+      case string.split(data, on: ",") {
+        [""] -> Error("")
+        splitted -> Ok(splitted)
+      }
+    })
+
+  #(parsed_rules, parsed_cases)
+}
+
+fn is_number_in_every_list(number: String, check_numbers: Cases) -> Bool {
+  check_numbers
+  |> list.all(fn(a) { a |> list.contains(number) })
+}
+
+fn validate_case_with_rules(
+  input: List(String),
+  allowed_numbers: List(List(String)),
+  rules: DictRules,
+  acc: Bool,
+) -> Bool {
+  case acc, input {
+    False, _ -> acc
+    _, [] -> acc
+    _, [n, ..rest] -> {
+      let actual_number_rules =
+        dict.get(rules, n)
+        |> result.unwrap([])
+
+      case allowed_numbers {
+        [] -> validate_case_with_rules(rest, [actual_number_rules], rules, acc)
+        check_numbers -> {
+          case is_number_in_every_list(n, check_numbers) {
+            False -> False
+            _ ->
+              validate_case_with_rules(
+                rest,
+                [actual_number_rules, ..check_numbers],
+                rules,
+                acc,
+              )
+          }
+        }
+      }
+    }
+  }
+}
+
+pub fn filter_cases(cases: Cases, rules: DictRules) -> Cases {
+  cases
+  |> list.filter(fn(c) { validate_case_with_rules(c, [], rules, True) })
+}
+
+pub fn calculate_middle_number(cases: Cases) -> Int {
+  cases
+  |> list.map(fn(c) {
+    let idx_middle = list.length(c) / 2
+
+    let assert Ok(i) =
+      c
+      |> list.take(idx_middle + 1)
+      |> list.last
+      |> result.unwrap("0")
+      |> int.parse
+    i
+  })
+  |> list.fold(0, int.add)
+}
diff --git a/test/day_05_test.gleam b/test/day_05_test.gleam
new file mode 100644
index 0000000..907b719
--- /dev/null
+++ b/test/day_05_test.gleam
@@ -0,0 +1,81 @@
+import day_05
+import gleam/dict
+import gleeunit
+import gleeunit/should
+import simplifile
+
+pub fn main() {
+  gleeunit.main()
+}
+
+pub fn parse_input_test() {
+  let assert Ok(file) = simplifile.read("input/day_05.test")
+
+  let dict_of_rules =
+    dict.from_list([
+      #("29", ["13"]),
+      #("47", ["29", "61", "13", "53"]),
+      #("53", ["13", "29"]),
+      #("61", ["29", "53", "13"]),
+      #("75", ["13", "61", "47", "53", "29"]),
+      #("97", ["75", "53", "29", "47", "61", "13"]),
+    ])
+
+  let list_of_cases = [
+    ["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"],
+  ]
+
+  let #(rules, cases) =
+    file
+    |> day_05.parse_input
+
+  should.equal(rules, dict_of_rules)
+  should.equal(cases, list_of_cases)
+}
+
+pub fn filter_correct_cases_test() {
+  let assert Ok(file) = simplifile.read("input/day_05.test")
+
+  let #(rules, cases) =
+    file
+    |> day_05.parse_input
+
+  cases
+  |> day_05.filter_cases(rules)
+  |> should.equal([
+    ["75", "47", "61", "53", "29"],
+    ["97", "61", "53", "29", "13"],
+    ["75", "29", "13"],
+  ])
+}
+
+pub fn calculate_middle_number_of_cases_test() {
+  let assert Ok(file) = simplifile.read("input/day_05.test")
+
+  let #(rules, cases) =
+    file
+    |> day_05.parse_input
+
+  cases
+  |> day_05.filter_cases(rules)
+  |> day_05.calculate_middle_number
+  |> should.equal(143)
+}
+
+pub fn calculate_middle_number_of_cases_for_real_test() {
+  let assert Ok(file) = simplifile.read("input/day_05")
+
+  let #(rules, cases) =
+    file
+    |> day_05.parse_input
+
+  cases
+  |> day_05.filter_cases(rules)
+  |> day_05.calculate_middle_number
+  |> should.equal(5374)
+}
-- 
2.51.2