Solve 2025-02

Author: PassiDel

2025/02/2025-02.run.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="2025-02" type="BunRunConfiguration">
+    <option name="program" value="2025/02/run.ts" />
+    <option name="workingDirectory" value="$PROJECT_DIR$" />
+    <method v="2" />
+  </configuration>
+</component>

2025/02/index.test.ts

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+import { describe, expect, it } from 'bun:test';
+import {
+  findMultiRepetition,
+  findSingleRepetition,
+  solveFirst,
+  solveSecond,
+  sumMatches
+} from './index.ts';
+
+describe('2025-02', () => {
+  const testInput = `11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124`;
+  it('first', () => {
+    expect(solveFirst(testInput)).toBe(1227775554);
+  });
+  it('second', () => {
+    expect(solveSecond(testInput)).toBe(4174379265);
+  });
+  it('findSingleRepetition', () => {
+    expect(sumMatches([[11, 22]], findSingleRepetition)).toBe(11 + 22);
+    expect(sumMatches([[95, 115]], findSingleRepetition)).toBe(99);
+    expect(sumMatches([[1188511880, 1188511890]], findSingleRepetition)).toBe(
+      1188511885
+    );
+    expect(sumMatches([[565653, 565659]], findSingleRepetition)).toBe(0);
+  });
+  it('findMultiRepetition', () => {
+    expect(sumMatches([[11, 22]], findMultiRepetition)).toBe(11 + 22);
+    expect(sumMatches([[95, 115]], findMultiRepetition)).toBe(99 + 111);
+    expect(sumMatches([[1188511880, 1188511890]], findMultiRepetition)).toBe(
+      1188511885
+    );
+    expect(sumMatches([[565653, 565659]], findMultiRepetition)).toBe(565656);
+  });
+});

2025/02/index.ts

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+import type { Coordinate, Coordinates } from '../../utils/coordinates.ts';
+
+function parseInput(input: string) {
+  const regex = /(\d*)-(\d*)/gm;
+  const match = input.matchAll(regex);
+
+  return Array.from(match, (m) => [Number(m[1]), Number(m[2])] as Coordinate);
+}
+
+export function sumMatches(ranges: Coordinates, foundRegex: RegExp) {
+  return ranges.reduce((s, range) => {
+    for (let i = range[0]; i <= range[1]; i++) {
+      if (foundRegex.test(String(i))) {
+        s += i;
+      }
+    }
+
+    return s;
+  }, 0);
+}
+
+export const findSingleRepetition = /^(\d*?)\1$/;
+export function solveFirst(input: string): number {
+  const ranges = parseInput(input);
+
+  return sumMatches(ranges, findSingleRepetition);
+}
+
+export const findMultiRepetition = /^(\d*?)\1+$/;
+export function solveSecond(input: string): number {
+  const ranges = parseInput(input);
+
+  return sumMatches(ranges, findMultiRepetition);
+}

2025/02/run.ts

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+import { join } from 'path';
+import { solveFirst, solveSecond } from './index.ts';
+
+const input = await Bun.file(join(__dirname, 'input.txt')).text();
+
+const firstAnswer = solveFirst(input);
+
+console.log(firstAnswer);
+
+const secondAnswer = solveSecond(input);
+
+console.log(secondAnswer);