part2.ts

import * as fs from 'fs';
const input = fs.readFileSync('input', 'utf8').split('\n');

const copies = Array(input.length).fill(1);

for (let i = 0; i < input.length; i++) {
	const [winningNumbers, numbers] = input[i]
		.split(': ')[1]
		.split(' | ')
		.map((x) =>
			x
				.split(' ')
				.filter((x) => x != '')
				.map((y) => Number(y)),
		);
	let winningAmount = 0;
	for (const winningNumber of winningNumbers) {
		if (numbers.includes(winningNumber)) winningAmount++;
	}
	for (let j = i + 1; j <= i + winningAmount; j++) {
		copies[j] += copies[i];
	}
}

const result = copies.reduce((a, x) => a + x, 0);
console.log(result);