add day-05 + benchmarks

day-05/internal/two/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-05/internal/two
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.01270 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-05/internal/two	0.083s

day-05/internal/two/solve.go

@@ -0,0 +1,65 @@
+package two
+
+import (
+	"bytes"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/onyx-and-iris/aoc2024/day-05/internal/util"
+)
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	data, err := util.ParseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	var sum int
+
+	for i, products := range data[1] {
+		inOrder := true
+		for _, product := range products {
+			for _, rulesets := range data[0] {
+				if !slices.Contains(rulesets, product) {
+					continue
+				}
+
+				indx1, indx2 := slices.Index(products, rulesets[0]), slices.Index(products, rulesets[1])
+				if indx1 != -1 && indx2 != -1 && indx2 < indx1 {
+					inOrder = false
+					break
+				}
+			}
+			if !inOrder {
+				break
+			}
+		}
+		if !inOrder {
+			sum += midOfFixedOrder(data[1][i], data[0])
+		}
+	}
+
+	return sum, nil
+}
+
+func midOfFixedOrder(products []int, rulesets [][]int) int {
+	log.Debugf("unordered products: %v", products)
+
+	for {
+		var sorts int
+		for _, ruleset := range rulesets {
+			indx1, indx2 := slices.Index(products, ruleset[0]), slices.Index(products, ruleset[1])
+			if indx1 != -1 && indx2 != -1 && indx2 < indx1 {
+				products[indx1], products[indx2] = products[indx2], products[indx1]
+				sorts++
+			}
+		}
+		if sorts == 0 {
+			break
+		}
+	}
+
+	return products[len(products)/2]
+}

day-05/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 BenchmarkSolve(b *testing.B) {
+	os.Stdout, _ = os.Open(os.DevNull)
+	Solve(data)
+}