add day-22 + benchmarks

day-22/internal/one/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-22/internal/one
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.03026 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-22/internal/one	0.219s

day-22/internal/one/solve.go

@@ -0,0 +1,29 @@
+package one
+
+import (
+	"bytes"
+
+	"github.com/onyx-and-iris/aoc2024/day-22/internal/randomiser"
+)
+
+const numIterations = 2000
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	secrets, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	var sum int
+	for _, secret := range secrets {
+		randomiser := randomiser.New(secret)
+
+		for range numIterations {
+			randomiser.Randomise()
+		}
+		sum += randomiser.Secret()
+	}
+
+	return sum, nil
+}

day-22/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-22/internal/one/util.go

@@ -0,0 +1,31 @@
+package one
+
+import (
+	"bufio"
+	"io"
+	"strconv"
+	"strings"
+)
+
+func parseLines(r io.Reader) ([]int, error) {
+	secrets := []int{}
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		secrets = append(secrets, mustConv(strings.TrimSpace(scanner.Text())))
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return secrets, nil
+}
+
+func mustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}