package helper import ( "errors" "io/ioutil" "sort" "strconv" "strings" ) type convert func(int) string func GetInput(filename string) ([]string, error) { content, err := ioutil.ReadFile(filename) if err != nil { return nil, err } lines := strings.Split(string(content), "\r\n") return lines, err } func GetFile(filename string) (string, error) { content, err := ioutil.ReadFile(filename) if err != nil { return "", err } return string(content), err } func MapToNumber(strings []string) ([]int, error) { var numbers []int for _, line := range strings { number, err := strconv.Atoi(line) if err != nil { return numbers, err } numbers = append(numbers, number) } return numbers, nil } func RunesToNumber(runes []rune) []int { var numbers []int for _, r := range runes { number := int(r - '0') numbers = append(numbers, number) } return numbers } func FindAddendsForSum(possibleAddends []int, sum int) (int, int, error) { var array = make([]int, len(possibleAddends)) copy(array, possibleAddends) sort.Ints(array) p1 := 0 p2 := len(array) - 1 for p1 < p2 { if array[p1]+array[p2] < sum { p1++ } if array[p1]+array[p2] > sum { p2-- } if array[p1]+array[p2] == sum { return array[p1], array[p2], nil } } return 0, 0, errors.New("No fitting Addends found") } func SliceIndex(limit int, predicate func(i int) bool) int { for i := 0; i < limit; i++ { if predicate(i) { return i } } return -1 } func DeleteAt(a []int, i int) []int { return append(a[:i], a[i+1:]...) } func Equal(a, b []int) bool { if len(a) != len(b) { return false } for i, v := range a { if v != b[i] { return false } } return true } func Contains(elem int, array []int) bool { for _, val := range array { if val == elem { return true } } return false } func AddNummbers(numbers ...int) int { result := 0 for _, number := range numbers { result += number } return result } func Transpose(in [][]int) [][]int { out := make([][]int, len(in[0])) for i := 0; i < len(in); i += 1 { for j := 0; j < len(in[0]); j += 1 { out[j] = append(out[j], in[i][j]) } } return out }