aoc22-03.mts

import { Advent, f } from "advent";
import { Set } from "immutable";

const { compute, computeCheck } = await Advent({ day: 3 });

// compute(1, async (input) => {
// 	const data = input.parse(f.nl(f.chrs()));
// 	let ans = 0;

// 	for (const line of data) {
// 		let firstHalf = line.slice(0, line.length / 2);
// 		let secondHalf = line.slice(line.length / 2);
// 		const f = Set(firstHalf);
// 		const s = Set(secondHalf);
// 		const intersection = f.intersect(s);
// 		for (const c of intersection) {
// 			if (c.toLowerCase() === c) {
// 				ans += c.charCodeAt(0) - "a".charCodeAt(0) + 1;
// 			} else {
// 				ans += c.charCodeAt(0) - "A".charCodeAt(0) + 27;
// 			}
// 		}
// 	}
// 	return ans;
// });

compute(2, async (input) => {
	const data = input.parse(f.nl(f.chrs()));
	let ans = 0;

	for (let i = 0; i < data.length; i += 3) {
		const first = Set(data[i]);
		const second = Set(data[i + 1]);
		const third = Set(data[i + 2]);
		const intersection = first.intersect(second).intersect(third);
		for (const c of intersection) {
			if (c.toLowerCase() === c) {
				ans += c.charCodeAt(0) - "a".charCodeAt(0) + 1;
			} else {
				ans += c.charCodeAt(0) - "A".charCodeAt(0) + 27;
			}
		}
	}
	return ans;
});