Started AOC 2020 - solved the first 4.5 days.

2020/day01.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"git.annabunch.es/annabunches/adventofcode/2020/lib/fileutils"
+)
+
+func main() {
+	step := os.Args[1]
+	values := fileutils.InputParserIntMap(os.Args[2])
+
+	switch step {
+	case "1":
+		for x, _ := range values {
+			if _, ok := values[2020-x]; ok {
+				answer := x * (2020 - x)
+				fmt.Println("The answer is:", answer)
+				return
+			}
+		}
+	case "2":
+		for x, _ := range values {
+			target := 2020 - x
+			for y, _ := range values {
+				if _, ok := values[target-y]; ok {
+					answer := x * y * (target - y)
+					fmt.Println("The answer is:", answer)
+					return
+				}
+			}
+		}
+	}
+}