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@@ -0,0 +1,70 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "log"
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+ "os"
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+)
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+
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+type Line struct {
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+ full string
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+ number int
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+}
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+
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+func readInput(file *os.File) []Line {
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+ scanner := bufio.NewScanner(file)
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+ var lines []Line
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+ const delta = 48
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+
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+ for scanner.Scan() {
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+ line := scanner.Text()
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+ if line == "" {
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+ break
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+ }
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+
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+ current := Line{full: line}
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+ var digit byte
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+ haveFirst := false
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+ for i := range line {
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+ if line[i] >= delta && line[i] <= 57 {
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+ digit = line[i]
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+ if !haveFirst {
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+ current.number = int(digit-delta) * 10
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+ haveFirst = true
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+ }
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+ }
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+ }
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+
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+ current.number += int(digit - delta)
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+ lines = append(lines, current)
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+
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+ }
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+
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+ return lines
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+}
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+
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+func part1(lines []Line) int {
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+ var sum int
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+ for i := range lines {
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+ sum += lines[i].number
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+ }
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+
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+ return sum
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+}
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+
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+func main() {
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+ if len(os.Args) < 2 {
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+ log.Fatal("You need to specify a file!")
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+ }
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+
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+ filePath := os.Args[1]
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+ file, err := os.Open(filePath)
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+ if err != nil {
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+ log.Fatalf("Failed to open %s!\n", filePath)
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+
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+ }
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+
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+ lines := readInput(file)
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+ fmt.Println("Part1:", part1(lines))
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+}
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