41 lines
646 B
Go
41 lines
646 B
Go
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package d2
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import (
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"log"
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"strconv"
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"strings"
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)
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func P2(input string) int {
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directions := strings.Split(strings.TrimSpace(input), "\n")
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x := 0
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y := 0
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aim := 0
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for _, direction := range directions {
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directionAndValue := strings.Split(strings.TrimSpace(direction), " ")
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if len(directionAndValue) != 2 {
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log.Fatal("line has wrong number of elements: ", direction)
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}
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value, err := strconv.Atoi(directionAndValue[1])
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if err != nil {
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log.Fatal(err)
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}
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switch directionAndValue[0] {
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case "forward":
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y += aim * value
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x += value
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case "down":
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aim += value
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case "up":
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aim -= value
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}
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}
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return x * y
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}
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