Created
December 6, 2023 19:27
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Advent of code 2023, day 1
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| package main | |
| import ( | |
| "bufio" | |
| "log" | |
| "os" | |
| "regexp" | |
| "strconv" | |
| "unicode/utf8" | |
| ) | |
| func StringToInt(str string) (int, error) { | |
| number, error := strconv.Atoi(str) | |
| if error != nil { | |
| return 0, error | |
| } | |
| return number, nil | |
| } | |
| func main() { | |
| onlyDigitsRegex := regexp.MustCompile("[0-9]+") | |
| result := 0 | |
| input, error := os.Open("input.txt") | |
| if error != nil { | |
| log.Fatal(error) | |
| input.Close() | |
| return | |
| } | |
| scanner := bufio.NewScanner(input) | |
| for scanner.Scan() { | |
| line := scanner.Text() | |
| onlyNumbers := onlyDigitsRegex.FindAllString(line, -1) | |
| firstDigit := string(onlyNumbers[0][0]) | |
| lastString := onlyNumbers[len(onlyNumbers)-1] | |
| lastDigit := string(lastString[utf8.RuneCountInString(lastString)-1]) | |
| number, _ := StringToInt(firstDigit + lastDigit) | |
| result += number | |
| } | |
| input.Close() | |
| println("The result is ", result) | |
| } |
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