expeditaet/solutions/typescript/2022/07/src/p2.ts

Advent of Code Solutions

import { split, task } from '@alexaegis/advent-of-code-lib';
import packageJson from '../package.json';
import { ExpeditionFileSystem } from './expedition-file-system.class.js';

const TOTAL_DISK_SPACE = 70_000_000;
const REQUIRED_FREE_SPACE = 30_000_000;

export const p2 = (input: string): number => {
	const fs = new ExpeditionFileSystem().interpret(split(input));

	const currentSize = fs.root.size;
	const currentFreeSpace = TOTAL_DISK_SPACE - currentSize;
	const freeTreshold = REQUIRED_FREE_SPACE - currentFreeSpace;

	const deleteCandidates = [...fs.root.walkDirectories()]
		.filter((dir) => dir.size >= freeTreshold)
		.sort((a, b) => a.size - b.size);

	return deleteCandidates[0]?.size ?? 0;
};

await task(p2, packageJson.aoc); // 8319096 ~0.65ms