aoc2024/day-18/internal/two/util.go

package two

import (
	"bufio"
	"io"
	"strconv"
	"strings"

	"github.com/onyx-and-iris/aoc2024/day-18/internal/config"
)

func parseLines(r io.Reader, config config.Config) (*graph, [][]int, error) {
	corruptedCoords := [][]int{}
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		corruptedCoords = append(corruptedCoords, func() []int {
			x := strings.Split(scanner.Text(), ",")
			return []int{mustConv(x[0]), mustConv(x[1])}
		}())
	}

	if err := scanner.Err(); err != nil {
		return nil, nil, err
	}

	graph := newGraph(config.Width, config.Height, config.NumCorruptions, corruptedCoords)
	return graph, corruptedCoords, nil
}

func mustConv(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		panic(err)
	}
	return n
}

func replaceAtIndex(s string, r rune, i int) string {
	out := []rune(s)
	out[i] = r
	return string(out)
}