58 lines
951 B
Go
58 lines
951 B
Go
package main
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import (
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"fmt"
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"bufio"
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"os"
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"strconv"
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)
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func check(e error) {
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if e != nil {
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panic(e)
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}
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}
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func ExtractCalibration(s string) string {
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firstDigit := 0
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lastDigit := 0
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index := 0
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for i := 0; i < len(s); i++ {
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if num, err := strconv.Atoi(string(s[i])); err == nil {
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firstDigit = num
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index = i
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break
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}
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}
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for j := len(s) - 1; j >= index; j-- {
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if num, err := strconv.Atoi(string(s[j])); err == nil {
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lastDigit = num
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break
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}
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}
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return fmt.Sprint(firstDigit) + fmt.Sprint(lastDigit)
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}
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func main() {
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file, err := os.Open("input")
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check(err)
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var total int = 0
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := scanner.Text()
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calibration := ExtractCalibration(line)
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num, err := strconv.Atoi(calibration)
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_ = err
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total += num
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}
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fmt.Println(total)
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}
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