55 lines
1016 B
Go
55 lines
1016 B
Go
package main
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import (
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"flag"
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"fmt"
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"math"
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"os"
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"regexp"
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"sort"
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"strconv"
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)
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var (
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inputFile = flag.String("input", "input.txt", "input filename")
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reLine = regexp.MustCompile(`(?m)^(\d+)\s+(\d+)$`)
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)
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func main() {
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flag.Parse()
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input, err := os.ReadFile(*inputFile)
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if err != nil {
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panic(err)
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}
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var leftList, rightList []int
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for _, match := range reLine.FindAllStringSubmatch(string(input), -1) {
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leftNumber, err := strconv.Atoi(match[1])
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if err != nil {
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panic(err)
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}
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rightNumber, err := strconv.Atoi(match[2])
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if err != nil {
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panic(err)
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}
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leftList = append(leftList, leftNumber)
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rightList = append(rightList, rightNumber)
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}
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sort.SliceStable(leftList, func(i, j int) bool {
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return leftList[i] < leftList[j]
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})
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sort.SliceStable(rightList, func(i, j int) bool {
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return rightList[i] < rightList[j]
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})
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totalDistance := 0
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for i := 0; i < len(leftList); i++ {
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totalDistance += int(math.Abs(float64(leftList[i] - rightList[i])))
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}
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fmt.Println(totalDistance)
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}
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