76 lines
2.0 KiB
TypeScript
76 lines
2.0 KiB
TypeScript
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import fs from "fs";
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import {Engine} from "./day_three";
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import {forEach} from "lodash";
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export class Scratchcard {
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private readonly numbers: number[];
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private readonly winningNumbers: number[];
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private children: Scratchcard[] = [];
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constructor(input: string) {
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const [_, withoutId] = input.split(':');
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const [winning, ourNumbers] = withoutId.split('|');
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this.winningNumbers = this.parseNumberList(winning);
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this.numbers = this.parseNumberList(ourNumbers);
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}
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private parseNumberList(input: string): number[] {
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return [...input.matchAll(/\d+/g)].map(match => parseInt(match[0], 10));
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}
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public get matches() {
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return this.numbers.filter(number => this.winningNumbers.includes(number));
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}
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get score() {
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const matches = this.matches;
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if (!matches.length) return 0;
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if (matches.length === 1) return 1;
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return Math.pow(2, Math.max(matches.length - 1, 1));
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}
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get isWinner() {
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return Boolean(this.matches.length);
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}
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public setChildren(children: Scratchcard[]) {
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this.children = children;
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}
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get size(): number {
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return 1 + this.children.reduce((totalSize, child) => totalSize + child.size, 0);
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}
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}
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export class ScratchcardSet {
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private readonly scratchcards: Scratchcard[];
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constructor(inputs: string[]) {
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this.scratchcards = inputs.map(input => new Scratchcard(input));
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this.scratchcards.forEach((scratchcard, index) => {
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if (scratchcard.isWinner) {
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const children = this.scratchcards.slice(index + 1, index + 1 + scratchcard.matches.length);
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scratchcard.setChildren(children);
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}
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});
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}
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get totalScore() {
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return this.scratchcards.reduce((total, scratchcard) => total + scratchcard.score, 0);
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}
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get length() {
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return this.scratchcards.reduce((totalSize, scratchcard) => totalSize + scratchcard.size, 0);
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}
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}
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export const runDayFour = () => {
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const input = fs.readFileSync('./inputs/day_four_input.txt', 'utf8').split('\n').filter(Boolean);
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const scratchCards = new ScratchcardSet(input);
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console.log(scratchCards.totalScore);
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console.log(scratchCards.length);
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}
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