59 lines
1006 B
Go
59 lines
1006 B
Go
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package main
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import (
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"fmt"
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"os"
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"strings"
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"strconv"
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"sort"
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)
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func check(e error) {
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if e != nil {
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panic(e)
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}
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}
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func abs(n int) int {
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if n < 0 {
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return -n
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}
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return n
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}
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func main() {
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// read in file as lines
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dat, err := os.ReadFile("data.txt")
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check(err)
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lines := strings.Split(string(dat), "\n")
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// construct lists
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left_list := []int{}
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right_list := []int{}
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for i := range len(lines) - 1 {
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numbers := strings.Split(lines[i], " ")
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left_num, err := strconv.Atoi(numbers[0])
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check(err)
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right_num, err := strconv.Atoi(numbers[1])
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check(err)
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left_list = append(left_list, left_num)
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right_list = append(right_list, right_num)
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}
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// sort lists
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sort.Ints(left_list)
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sort.Ints(right_list)
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// count difference
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distance := 0
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for i := range left_list {
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distance += abs(left_list[i] - right_list[i])
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}
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fmt.Println(distance)
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}
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