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@@ -0,0 +1,52 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "log"
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+ "os"
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+ "strings"
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+)
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+
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+const delta byte = 97
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+
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+func readInput(file *os.File) ([][]string, []string) {
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+ scanner := bufio.NewScanner(file)
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+ patterns := make([][]string, 25)
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+ var towels []string
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+
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+ var patternsRead bool
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+ for scanner.Scan() {
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+ line := scanner.Text()
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+ if line == "" {
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+ patternsRead = true
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+ continue
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+ }
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+
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+ if !patternsRead {
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+ parts := strings.Split(line, ", ")
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+ for _, part := range parts {
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+ patterns[part[0]-delta] = append(patterns[part[0]-delta], part)
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+ }
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+ } else {
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+ towels = append(towels, line)
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+ }
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+ }
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+
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+ return patterns, towels
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+}
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+
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+func main() {
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+ if len(os.Args) < 2 {
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+ log.Fatal("You need to specify a file!")
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+ }
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+
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+ filePath := os.Args[1]
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+ file, err := os.Open(filePath)
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+ if err != nil {
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+ log.Fatalf("Failed to open %s!\n", filePath)
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+ }
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+
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+ patterns, towels := readInput(file)
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+ fmt.Println(patterns, towels)
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+}
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