Solved for sample, not for input

01/code.go

@@ -12,10 +12,11 @@ type Line struct {
 	number int
 }
 
+const delta = 48
+
 func readInput(file *os.File) []Line {
 	scanner := bufio.NewScanner(file)
 	var lines []Line
-	const delta = 48
 
 	for scanner.Scan() {
 		line := scanner.Text()
@@ -53,6 +54,77 @@ func part1(lines []Line) int {
 	return sum
 }
 
+var digits map[string]byte
+
+func init() {
+	digits = make(map[string]byte)
+	digits["one"] = '1'
+	digits["two"] = '2'
+	digits["three"] = '3'
+	digits["four"] = '4'
+	digits["five"] = '5'
+	digits["six"] = '6'
+	digits["seven"] = '7'
+	digits["eight"] = '8'
+	digits["nine"] = '9'
+}
+
+func part2(lines []Line) int {
+	var sum int
+	for i := range lines {
+		line := lines[i].full
+		var digit byte
+		var number int
+		index := 0
+		end := len(line)
+		haveFirst := false
+		for {
+			if index >= end {
+				break
+			}
+
+			if line[index] >= delta && line[index] <= 57 {
+				digit = line[index]
+				if !haveFirst {
+					number = int(digit-delta) * 10
+					haveFirst = true
+				}
+
+				index++
+				continue
+			}
+
+			found := false
+			for j := 3; j < 6; j++ {
+				if index+j > end {
+					break
+				}
+
+				value, ok := digits[line[index:index+j]]
+				if ok {
+					digit = value
+					if !haveFirst {
+						number = int(digit-delta) * 10
+						haveFirst = true
+					}
+
+					index += j
+					found = true
+					break
+				}
+			}
+
+			if !found {
+				index++
+			}
+		}
+
+		number += int(digit - delta)
+		sum += number
+	}
+
+	return sum
+}
 func main() {
 	if len(os.Args) < 2 {
 		log.Fatal("You need to specify a file!")
@@ -67,4 +139,5 @@ func main() {
 
 	lines := readInput(file)
 	fmt.Println("Part1:", part1(lines))
+	fmt.Println("Part2:", part2(lines))
 }