add day-23 + benchmarks

day-23/internal/one/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-23/internal/one
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.003422 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-23/internal/one	0.029s

day-23/internal/one/solve.go

@@ -0,0 +1,51 @@
+package one
+
+import (
+	"bytes"
+	"slices"
+	"strings"
+
+	"github.com/onyx-and-iris/aoc2024/day-23/internal/set"
+)
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	connections, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	networks := make(map[string]*set.Set)
+	for _, connection := range connections {
+		if _, found := networks[connection[0]]; !found {
+			networks[connection[0]] = set.New()
+		}
+		networks[connection[0]].Add(connection[1])
+
+		if _, found := networks[connection[1]]; !found {
+			networks[connection[1]] = set.New()
+		}
+		networks[connection[1]].Add(connection[0])
+	}
+
+	setIdentifiers := make(map[string]struct{})
+	for name := range networks {
+		if !strings.HasPrefix(name, "t") {
+			continue
+		}
+
+		for _, node := range networks[name].List() {
+			for _, node2 := range networks[node].List() {
+				if slices.Contains(networks[node2].List(), name) {
+					s := set.New()
+					s.Add(name)
+					s.Add(node)
+					s.Add(node2)
+					setIdentifiers[s.String()] = struct{}{}
+				}
+			}
+		}
+	}
+
+	return len(setIdentifiers), nil
+}

day-23/internal/one/solve_internal_test.go

@@ -0,0 +1,15 @@
+package one
+
+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)
+}

day-23/internal/one/util.go

@@ -0,0 +1,22 @@
+package one
+
+import (
+	"bufio"
+	"io"
+	"strings"
+)
+
+func parseLines(r io.Reader) ([][]string, error) {
+	connections := [][]string{}
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		connections = append(connections, strings.Split(scanner.Text(), "-"))
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return connections, nil
+}