AoC2025: day 5 part 1

Author: martapanc

2024-2025/src/2025/day05/day05.test.ts

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+import {part1, part2} from "./day05";
+
+describe('2025 Day 5', () => {
+    test('Part 1', async () => {
+        expect(await part1('testInput1')).toEqual(3);
+        expect(await part1('input')).toEqual(733);
+    });
+
+    test('Part 2', async () => {
+        // expect(await part2('testInput1')).toEqual(31);
+        // expect(await part2('input')).toEqual(29379307);
+    });
+});

2024-2025/src/2025/day05/day05.ts

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+import path from "node:path";
+import {readInputLineByLine} from "@utils/io";
+
+export async function part1(inputFile: string) {
+    return await day5(inputFile, findFreshIngredients);
+}
+
+export async function part2(inputFile: string) {
+    return await day5(inputFile);
+}
+
+type IdRange = { from: number; to: number };
+
+async function day5(inputFile: string, calcFn?: (idRanges: IdRange[], ingredientIds: number[]) => number) {
+    const inputPath = path.join(__dirname, inputFile);
+    const lines = await readInputLineByLine(inputPath);
+
+    const idRanges: IdRange[] = [];
+    const ingredientIds: number[] = [];
+    for (const line of lines) {
+        if (line === '')
+            continue;
+        if (line.indexOf('-') !== -1) {
+            const split = line.split('-').map(Number);
+            idRanges.push({from: split[0], to: split[1]});
+        } else {
+            ingredientIds.push(Number(line));
+        }
+    }
+
+    return calcFn?.(idRanges, ingredientIds);
+}
+
+function findFreshIngredients(idRanges: IdRange[], ingredientIds: number[]): number {
+    let freshCount = 0;
+    for (const id of ingredientIds)
+        for (const idRange of idRanges) {
+            if (id < idRange.from || id > idRange.to)
+                continue;
+            else {
+                freshCount++
+                break;
+            }
+        }
+    return freshCount;
+}

2024-2025/src/2025/day05/testInput1

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