feat(2017): refactor day 9

Author: markkovari

2017/days/9/day09.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"github.com/markkovari/advent_of_code/aoc-go-common"
+)
+
+type Day09 struct{}
+
+func (d Day09) Part1(input string) string {
+	score, _ := solve(input)
+	return fmt.Sprintf("%d", score)
+}
+
+func (d Day09) Part2(input string) string {
+	_, garbage := solve(input)
+	return fmt.Sprintf("%d", garbage)
+}
+
+func solve(input string) (int, int) {
+	score, depth, garbage, totalGarbage := 0, 0, false, 0
+	skip := false
+	for _, c := range input {
+		if skip { skip = false; continue }
+		if c == '!' { skip = true; continue }
+		if garbage {
+			if c == '>' { garbage = false } else { totalGarbage++ }
+		} else {
+			if c == '<' { garbage = true } else if c == '{' { depth++; score += depth } else if c == '}' { depth-- }
+		}
+	}
+	return score, totalGarbage
+}
+
+func main() { common.Run(2017, 9, Day09{}) }