expeditaet/solutions/typescript/2020/06/src/p2.ts

Advent of Code Solutions

import { task } from '@alexaegis/advent-of-code-lib';
import { sum } from '@alexaegis/advent-of-code-lib/math';
import packageJson from '../package.json';

export const p2 = (input: string): number =>
	input
		.split(/\r?\n\r?\n/)
		.map((rawGroup) => rawGroup.split(/\r?\n/g))
		.map((group) => {
			const letterCounts = [...group.join('')]
				.reduce(
					(map, letter) => map.set(letter, (map.get(letter) ?? 0) + 1),
					new Map<string, number>(),
				)
				.values();
			return [...letterCounts].count((v) => v === group.length);
		})
		.reduce(sum);

await task(p2, packageJson.aoc); // 3299 ~2.2ms