aoc2024/day-14/internal/one/solve.go

package one

import (
	"bytes"
)

func Solve(buf []byte) (int, error) {
	r := bytes.NewReader(buf)
	robots, err := parseLines(r)
	if err != nil {
		return 0, err
	}

	const numSeconds int = 100
	const width, height dimension = 101, 103

	graph := newGraph(width, height)

	for range numSeconds {
		for _, robot := range robots {
			robot.update(width, height)
		}
	}
	graph.update(robots)

	safetyFactor := 1
	for _, v := range calculateQuadrants(graph) {
		safetyFactor *= v
	}

	return safetyFactor, nil
}

func calculateQuadrants(g *graph) []int {
	topLeft := g.quadrant(0, len(g.data[0])/2, 0, len(g.data)/2)
	topRight := g.quadrant(len(g.data[0])/2+1, len(g.data[0]), 0, len(g.data)/2)
	bottomLeft := g.quadrant(0, len(g.data[0])/2, len(g.data)/2+1, len(g.data))
	bottomRight := g.quadrant(len(g.data[0])/2+1, len(g.data[0]), len(g.data)/2+1, len(g.data))

	return []int{topLeft, topRight, bottomLeft, bottomRight}
}