aoc2024/day-18/internal/one/graph.go

package one

import (
	"slices"
	"strings"
)

type graph struct {
	start Point
	end   Point
	data  []string
}

func newGraph(width, height, numCorruptions int, corruptedCoords [][]int) *graph {
	var data []string
	var sb strings.Builder
	for range height {
		for range width {
			sb.WriteRune('.')
		}
		data = append(data, sb.String())
		sb.Reset()
	}

	for _, coords := range corruptedCoords[:numCorruptions] {
		data[coords[1]] = replaceAtIndex(data[coords[1]], '#', coords[0])
	}

	return &graph{Point{0, 0}, Point{len(data[0]) - 1, len(data) - 1}, data}
}

func (g *graph) String() string {
	return strings.Join(g.data, "\n")
}

func (g *graph) isOutOfBounds(p Point) bool {
	return p.X < 0 || p.Y < 0 || p.Y >= len(g.data) || p.X >= len(g.data[p.Y])
}

func (g *graph) valueAt(p Point) rune {
	return rune(g.data[p.Y][p.X])
}

func (g *graph) debug(path []Point) string {
	temp := slices.Clone(g.data)
	for _, p := range path {
		temp[p.Y] = replaceAtIndex(temp[p.Y], 'O', p.X)
	}
	return strings.Join(temp, "\n")
}