add daythree + benchmarks

day-03/internal/two/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-03/internal/two
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkMain-12    	1000000000	         0.0006480 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-03/internal/two	0.010s

day-03/internal/two/solve.go

@@ -0,0 +1,58 @@
+package two
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"regexp"
+
+	"github.com/onyx-and-iris/aoc2024/day-03/internal/util"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var reMulOrDoOrDont = regexp.MustCompile(`mul\((?P<first>[0-9]{1,3}),(?P<second>[0-9]{1,3})\)|do\(\)|don't\(\)`)
+
+func Solve(data []byte) (int, error) {
+	r := bytes.NewReader(data)
+	sum, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}
+
+func parseLines(r io.Reader) (int, error) {
+	var sum int
+	var do bool = true
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		m := reMulOrDoOrDont.FindAllString(scanner.Text(), -1)
+		for _, v := range m {
+			switch v {
+			case "do()":
+				do = true
+				log.Debug("hit a do")
+			case "don't()":
+				do = false
+				log.Debug("hit a don't")
+			}
+
+			if do {
+				groups := util.GetGroups(reMulOrDoOrDont, v)
+				if groups["first"] != "" && groups["second"] != "" {
+					log.Debugf("%s * %s\n", groups["first"], groups["second"])
+					sum += util.MustConv(groups["first"]) * util.MustConv(groups["second"])
+				}
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return 0, err
+	}
+
+	return sum, nil
+}

day-03/internal/two/solve_internal_test.go

@@ -0,0 +1,15 @@
+package two
+
+import (
+	_ "embed"
+	"os"
+	"testing"
+)
+
+//go:embed testdata/input.txt
+var data []byte
+
+func BenchmarkMain(b *testing.B) {
+	os.Stdout, _ = os.Open(os.DevNull)
+	Solve(data)
+}