Day One

1 files changed, 40 insertions, 0 deletions

diff --git a/one.go b/one.go
new file mode 100644
index 0000000..cf27820
--- /dev/null
+++ b/one.go
@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strconv"
+)
+
+func main() {
+	start, sum, fuelsum := 0, 0, 0
+	if len(os.Args) < 2 {
+		panic("runtime error: missing operand")
+	}
+	file, err := ioutil.ReadFile(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+	for i := 0; i < len(file); i++ {
+		if file[i] == '\n' {
+			arg, err := strconv.Atoi(string(file[start:i])) // i-1??
+			if err != nil {
+				panic(err)
+			}
+			start = i + 1
+			sum += (arg / 3) - 2
+			fuelsum += tyranny(arg)
+		}
+	}
+	fmt.Println(sum)
+	fmt.Println(fuelsum)
+}
+
+func tyranny(mass int) int {
+	subtotal := 0
+	for fuel := (mass / 3) - 2; fuel >= 0; fuel = (fuel / 3) - 2 {
+		subtotal += fuel
+	}
+	return subtotal
+}