add day-05 + benchmarks

day-05/internal/util/util.go

@@ -0,0 +1,49 @@
+package util
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"strconv"
+	"strings"
+)
+
+func MustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func ParseLines(r io.Reader) ([][][]int, error) {
+	data := make([][][]int, 2)
+
+	filter := func(r rune) bool {
+		return r == '|' || r == ','
+	}
+
+	buf, err := io.ReadAll(r)
+	if err != nil {
+		log.Fatal(err)
+	}
+	parts := strings.Split(string(buf), "\n\n")
+
+	for i, part := range parts {
+		scanner := bufio.NewScanner(strings.NewReader(part))
+		for scanner.Scan() {
+			filtered := strings.FieldsFunc(scanner.Text(), filter)
+			var nums []int
+			for _, n := range filtered {
+				nums = append(nums, MustConv(n))
+			}
+			data[i] = append(data[i], nums)
+		}
+
+		if err := scanner.Err(); err != nil {
+			return nil, err
+		}
+	}
+
+	return data, nil
+}