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40 lines
720 B
Go
40 lines
720 B
Go
package main
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import (
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"bufio"
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"log"
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"os"
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"regexp"
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)
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// readlines reads lines from stdin.
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// returns input as an array of strings
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func readlines() []string {
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lines := []string{}
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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log.Fatal(err)
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}
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return lines
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}
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var r = regexp.MustCompile(`(?P<identifier>[A-Z0-9]{3}) = \((?P<entry>[A-Z0-9]{3}), (?P<exit>[A-Z0-9]{3})\)`)
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func parselines(lines []string) {
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directions = lines[0]
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steps = make(map[string][]string, len(lines[2:]))
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for _, line := range lines[2:] {
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m := r.FindStringSubmatch(line)
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if len(m) > 0 {
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steps[m[1]] = []string{m[2], m[3]}
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}
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}
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}
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