39 lines
772 B
Go
39 lines
772 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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"strconv"
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"strings"
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)
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func getCalibrationValue(input string) int {
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firstIdx := strings.IndexAny(input, "0123456789")
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lastIdx := strings.LastIndexAny(input, "0123456789")
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first := string([]rune(input)[firstIdx])
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last := string([]rune(input)[lastIdx])
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output, _ := strconv.Atoi(first + last)
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return output
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}
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func ScanFile(file *os.File) (int, error) {
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scanner := bufio.NewScanner(file);
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sum := 0;
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for scanner.Scan() {
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sum += getCalibrationValue(scanner.Text());
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}
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if err := scanner.Err(); err != nil {
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return 0, err
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}
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return sum, nil
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}
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func main() {
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sum, err := ScanFile(os.Stdin)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Invalid input: %s\n", err)
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return
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}
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fmt.Println(sum)
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} |