56 lines
887 B
Go
56 lines
887 B
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"regexp"
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"strconv"
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"strings"
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)
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func main() {
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horizontal := 0
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depth := 0
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aim := 0
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input, err := os.Open("input")
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if err != nil {
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panic(err)
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}
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defer input.Close()
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scanner := bufio.NewScanner(input)
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for scanner.Scan() {
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line := scanner.Text()
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re := regexp.MustCompile("[0-9]+")
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if !re.MatchString(line) {
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panic("Instruction does not contain number")
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}
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number, err := strconv.Atoi(re.FindString(line))
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if err != nil {
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panic(err)
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}
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if strings.HasPrefix(line, "forward") {
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horizontal += number
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depth += aim * number
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} else if strings.HasPrefix(line, "up") {
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aim -= number
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} else if strings.HasPrefix(line, "down") {
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aim += number
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} else {
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panic("Unknown instruction")
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}
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}
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fmt.Println(horizontal, depth, horizontal*depth)
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if err := scanner.Err(); err != nil {
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panic(err)
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}
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}
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