131 lines
3.0 KiB
Go
131 lines
3.0 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
"bufio"
|
|
"os"
|
|
"strconv"
|
|
)
|
|
|
|
var numbers = []string {
|
|
"one", "two", "three", "four", "five",
|
|
"six", "seven", "eight", "nine",
|
|
}
|
|
|
|
func check(e error) {
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
}
|
|
|
|
func ExtractCalibration(s string) string {
|
|
|
|
firstDigit := 0
|
|
lastDigit := 0
|
|
index := 0
|
|
|
|
// Start from the beginning of the string, stop when you find a number
|
|
for i := 0; i < len(s); i++ {
|
|
if num, err := strconv.Atoi(string(s[i])); err == nil {
|
|
firstDigit = num
|
|
index = i
|
|
break
|
|
}
|
|
}
|
|
|
|
// Start from the end of the string, stop when you find a number
|
|
for j := len(s) - 1; j >= index; j-- {
|
|
if num, err := strconv.Atoi(string(s[j])); err == nil {
|
|
lastDigit = num
|
|
break
|
|
}
|
|
}
|
|
|
|
|
|
return fmt.Sprint(firstDigit) + fmt.Sprint(lastDigit)
|
|
}
|
|
|
|
func SearchFirstIndex(s string) int {
|
|
// len(s) will always be bigger than the first index where you
|
|
// can have a substring match
|
|
index, number := len(s),0
|
|
// from 1 to 9, save the smallest index and the number
|
|
for i := 1; i < 10; i++ {
|
|
tempIndex := strings.Index(s, fmt.Sprint(i))
|
|
if tempIndex < index && tempIndex != -1 {
|
|
index = tempIndex
|
|
number = i
|
|
}
|
|
|
|
}
|
|
// again for strings, from [0] "one" to [8] "nine"
|
|
// save the smallest index, if smaller than the previous
|
|
for i := 0; i < 9; i++ {
|
|
tempIndex := strings.Index(s, numbers[i])
|
|
if tempIndex < index && tempIndex != -1 {
|
|
index = tempIndex
|
|
number = i + 1
|
|
}
|
|
}
|
|
|
|
return number
|
|
}
|
|
|
|
func SearchLastIndex(s string) int {
|
|
// -1 will always be smaller than the last index where you
|
|
// can have a substring match
|
|
index, number := -1,0
|
|
for i := 1; i < 10; i++ {
|
|
tempIndex := strings.LastIndex(s, fmt.Sprint(i))
|
|
if tempIndex > index && tempIndex != -1 {
|
|
index = tempIndex
|
|
number = i
|
|
}
|
|
|
|
}
|
|
for i := 0; i < 9; i++ {
|
|
tempIndex := strings.LastIndex(s, numbers[i])
|
|
if tempIndex > index && tempIndex != -1 {
|
|
index = tempIndex
|
|
number = i + 1
|
|
}
|
|
}
|
|
|
|
return number
|
|
}
|
|
|
|
func CombineIndexes(s string) int {
|
|
firstNumber := SearchFirstIndex(s)
|
|
secondNumber := SearchLastIndex(s)
|
|
|
|
combinedString := fmt.Sprint(firstNumber) + fmt.Sprint(secondNumber)
|
|
|
|
combinedNumber, err := strconv.Atoi(combinedString)
|
|
_ = err
|
|
|
|
return combinedNumber
|
|
}
|
|
|
|
func main() {
|
|
file, err := os.Open("input")
|
|
check(err)
|
|
|
|
var firstTotal int = 0
|
|
var secondTotal int = 0
|
|
|
|
scanner := bufio.NewScanner(file)
|
|
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
calibration := ExtractCalibration(line)
|
|
num, err := strconv.Atoi(calibration)
|
|
_ = err
|
|
firstTotal += num
|
|
secondTotal += CombineIndexes(line)
|
|
}
|
|
fmt.Printf("Calibration value, first method: %d\n", firstTotal)
|
|
fmt.Printf("Calibration value, second method: %d\n", secondTotal)
|
|
|
|
}
|