102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"log"
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"os"
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"strings"
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)
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const (
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one = "one"
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two = "two"
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three = "three"
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four = "four"
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five = "five"
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six = "six"
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seven = "seven"
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eight = "eight"
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nine = "nine"
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)
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func main() {
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file, err := os.Open("2023/day-1/files/input")
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if err != nil {
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log.Fatalf("ERROR: %v\n", err)
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}
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defer file.Close()
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fmt.Printf("Sum total: %d\n", calculateSumCalibrationValues(file))
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}
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func calculateSumCalibrationValues(r io.Reader) int {
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scanner := bufio.NewScanner(r)
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var (
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digits []int
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sum int
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)
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for scanner.Scan() {
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line := scanner.Text()
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sum = sum + calibrationValue(line, digits)
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}
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return sum
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}
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func calibrationValue(line string, digits []int) int {
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if len(line) > 0 {
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switch {
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case (line[0] >= '0') && (line[0] <= '9'):
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digits = append(digits, int(line[0]-'0'))
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return calibrationValue(line[1:], digits)
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case strings.HasPrefix(line, one):
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digits = append(digits, 1)
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trimLength := len(one) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, two):
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digits = append(digits, 2)
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trimLength := len(two) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, three):
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digits = append(digits, 3)
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trimLength := len(three) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, four):
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digits = append(digits, 4)
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trimLength := len(four) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, five):
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digits = append(digits, 5)
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trimLength := len(five) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, six):
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digits = append(digits, 6)
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trimLength := len(six) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, seven):
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digits = append(digits, 7)
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trimLength := len(seven) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, eight):
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digits = append(digits, 8)
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trimLength := len(eight) - 1
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return calibrationValue(line[trimLength:], digits)
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case strings.HasPrefix(line, nine):
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digits = append(digits, 9)
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trimLength := len(nine) - 1
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return calibrationValue(line[trimLength:], digits)
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default:
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return calibrationValue(line[1:], digits)
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}
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}
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if len(digits) == 0 {
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return 0
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}
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return (10*digits[0] + digits[len(digits)-1])
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}
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