expeditaet/solutions/typescript/2016/02/src/p1.ts

Advent of Code Solutions

import { split, task } from '@alexaegis/advent-of-code-lib';
import {
	BoundingBox,
	Direction,
	Vec2,
	isDirectionMarker,
} from '@alexaegis/advent-of-code-lib/model';
import packageJson from '../package.json';

const toKeypadNumber = (vec: Vec2): number => (2 - vec.y) * 3 + vec.x + 1;

export const p1 = (input: string): number => {
	const position = new Vec2(1, 1);

	const keypadArea = BoundingBox.fromVectors([Vec2.ORIGIN, new Vec2(2, 2)]);

	const result = split(input).reduce((acc, line) => {
		for (const direction of [...line]
			.filter(isDirectionMarker)
			.map((marker) => Direction.fromMarker(marker).reverse('v')))
			position.addMut(direction, { limit: keypadArea });
		return acc * 10 + toKeypadNumber(position);
	}, 0);

	return result;
};

await task(p1, packageJson.aoc); // 24862 ~2.6ms