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29 lines
440 B
Go
29 lines
440 B
Go
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package main
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const (
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LEFT = iota // 0
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RIGHT
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)
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var directions string
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var steps = map[string][]string{}
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// one returns the number of steps to reach 'ZZZ'
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func one(lines []string) int {
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parselines(lines)
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num := 0
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for i, step := 0, "AAA"; step != "ZZZ"; i, num = i+1, num+1 {
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if i == len(directions) {
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i = 0
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}
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if directions[i] == 'L' {
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step = steps[step][LEFT]
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} else {
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step = steps[step][RIGHT]
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}
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}
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return num
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}
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