import { readFile } from "fs/promises";


const fileToRead = `actual.input`;

const list1 = {};
const list2 = {};

const file = await readFile(fileToRead, `utf-8`);

for (const line of file.split(`\n`)) {
	const [ l1Add, l2Add ] = line.split(/\s+/, 2);

	list1[l1Add] ??= 0;
	list1[l1Add] += 1;

	list2[l2Add] ??= 0;
	list2[l2Add] += 1;
};

let similarity = 0;
for (const location in list1) {
	similarity += list1[location] * (location * (list2[location] ?? 0))
};

console.log(`Similarity: ${similarity}`);