feat(day_5): both exercises done

README.md

@@ -3,8 +3,9 @@
 [Advent of Code](https://adventofcode.com/) problems of 2025.
 
 | Day | Name                | Part 1 | Part 2 |
-| :-: | :-------------------- | :----: | :----: |
+| :-: | :------------------ | :----: | :----: |
 |  1  | Secret Entrance     |   ⭐   |   ⭐   |
 |  2  | Gift Shop           |   ⭐   |   ⭐   |
 |  3  | Lobby               |   ⭐   |   ⭐   |
 |  4  | Printing Department |   ⭐   |   ⭐   |
+|  5  | Cafeteria           |   ⭐   |   ⭐   |

src/__tests__/day_5_test.ts

@@ -0,0 +1,24 @@
+import { assertEquals } from "@std/assert";
+import {
+  count_all_possible_fresh_ingredients,
+  count_fresh_ingredients,
+  read_ingredient_database,
+} from "../exercises/day_5.ts";
+
+Deno.test("Day 5 - A", async () => {
+  const ingredient_db = await read_ingredient_database(
+    "src/exercises/assets/day_5_test_input.txt",
+  );
+  const total_fresh = count_fresh_ingredients(ingredient_db);
+
+  assertEquals(total_fresh, 3);
+});
+
+Deno.test("Day 5 - B", async () => {
+  const ingredient_db = await read_ingredient_database(
+    "src/exercises/assets/day_5_test_input.txt",
+  );
+  const total_fresh = count_all_possible_fresh_ingredients(ingredient_db);
+
+  assertEquals(total_fresh, 14);
+});

src/exercises/assets/day_5_test_input.txt

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32

src/exercises/day_5.ts

@@ -0,0 +1,118 @@
+interface IngredientDB {
+  fresh_ranges: { init: number; end: number }[];
+  ingredient_list: number[];
+}
+
+export default async function Cafeteria() {
+  const ingredient_db = await read_ingredient_database(
+    "src/exercises/assets/day_5_input.txt",
+  );
+  console.log(">> Total fresh: ", count_fresh_ingredients(ingredient_db));
+  console.log(
+    ">> Total available fresh: ",
+    count_all_possible_fresh_ingredients(ingredient_db),
+  );
+  // console.log(
+  //   ">> Total available fresh brute: ",
+  //   count_all_possible_fresh_ingredients_force(ingredient_db),
+  // );
+}
+
+// NOTE: brute force by memory
+export function count_all_possible_fresh_ingredients_force(
+  db: IngredientDB,
+): number {
+  const total_ingredients: Set<number> = new Set();
+  db.fresh_ranges.forEach((range) => {
+    for (let i = range.init; i <= range.end; i++) {
+      total_ingredients.add(i);
+    }
+  });
+  return total_ingredients.size;
+}
+
+export function count_all_possible_fresh_ingredients(db: IngredientDB): number {
+  let total_ingredients: number = 0;
+  const fresh_ranges_clean = merge_fresh_ranges(db.fresh_ranges);
+
+  fresh_ranges_clean.forEach((range) => {
+    total_ingredients += range.end - range.init + 1;
+  });
+  return total_ingredients;
+}
+
+function merge_fresh_ranges(
+  fresh_ranges: IngredientDB["fresh_ranges"],
+): IngredientDB["fresh_ranges"] {
+  const ranges: Array<IngredientDB["fresh_ranges"][number] | undefined> = [
+    ...fresh_ranges,
+  ];
+  ranges.forEach((_) => {
+    ranges.forEach((range, i) => {
+      for (
+        let next_range_index = 0;
+        next_range_index < ranges.length;
+        next_range_index++
+      ) {
+        const next_range = ranges[next_range_index];
+        if (!range || !next_range || next_range_index === i) {
+          continue;
+        }
+
+        // Check overlap
+        if (
+          (next_range.init >= range.init && next_range.init <= range.end) ||
+          (next_range.end >= range.init && next_range.end <= range.end) ||
+          (next_range.init <= range.init && next_range.end >= range.end)
+        ) {
+          // merge
+          range.init = Math.min(next_range.init, range.init);
+          range.end = Math.max(next_range.end, range.end);
+          ranges[next_range_index] = undefined;
+        }
+      }
+    });
+  });
+
+  return ranges.filter((range) => range !== undefined);
+}
+
+export function count_fresh_ingredients(db: IngredientDB): number {
+  let total_fresh: number = 0;
+  db.ingredient_list.forEach((ingredient) => {
+    db.fresh_ranges.every((range) => {
+      if (range.init <= ingredient && range.end >= ingredient) {
+        total_fresh += 1;
+        return false;
+      }
+      return true;
+    });
+  });
+
+  return total_fresh;
+}
+
+export async function read_ingredient_database(
+  path: string,
+): Promise<IngredientDB> {
+  const ingredient_db: IngredientDB = { fresh_ranges: [], ingredient_list: [] };
+
+  const input_txt = await Deno.readTextFile(path);
+  const input_divided = input_txt.split("\n\n");
+
+  for (const range of input_divided[0].split("\n")) {
+    const range_divided = range.split("-");
+    ingredient_db.fresh_ranges.push({
+      init: parseInt(range_divided[0]),
+      end: parseInt(range_divided[1]),
+    });
+  }
+
+  for (const ingredient of input_divided[1].split("\n")) {
+    if (ingredient?.length) {
+      ingredient_db.ingredient_list.push(parseInt(ingredient));
+    }
+  }
+
+  return ingredient_db;
+}