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67 lines
1.2 KiB

package helper
import (
"errors"
"io/ioutil"
"sort"
"strconv"
"strings"
)
func GetInput(filename string) ([]string, error) {
content, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
lines := strings.Split(string(content), "\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 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
}