Bootstrap and day 1 solution

days/01.go

@@ -0,0 +1,47 @@
+package days
+
+import (
+	"fmt"
+	"math"
+	"time"
+
+	"parnic.com/aoc2019/utilities"
+)
+
+type Day01 struct {
+	nums []int64
+}
+
+func (d *Day01) Parse() {
+	d.nums = utilities.GetIntLines("01p")
+	time.Sleep(time.Microsecond * 500)
+}
+
+func (d *Day01) calcFuel(mass int64) int64 {
+	return int64(math.Floor(float64(mass)/3)) - 2
+}
+
+func (d *Day01) Part1() string {
+	var totalFuel int64
+	for _, mass := range d.nums {
+		fuel := d.calcFuel(mass)
+		totalFuel += fuel
+	}
+
+	return fmt.Sprintf("Fuel required: %s%d%s", utilities.TextBold, totalFuel, utilities.TextReset)
+}
+
+func (d *Day01) Part2() string {
+	var totalFuel int64
+	for _, mass := range d.nums {
+		for mass > 0 {
+			fuel := d.calcFuel(mass)
+			if fuel > 0 {
+				totalFuel += fuel
+			}
+			mass = fuel
+		}
+	}
+
+	return fmt.Sprintf("Fuel required: %s%d%s", utilities.TextBold, totalFuel, utilities.TextReset)
+}