package one

import (
	"bufio"
	"io"
	"strings"
)

func parseLines(r io.Reader) ([][]string, error) {
	connections := [][]string{}

	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		connections = append(connections, strings.Split(scanner.Text(), "-"))
	}

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

	return connections, nil
}