add day-24 part1

day-24/.gitignore

@@ -0,0 +1 @@
+internal/two

day-24/cmd/cli/main.go

@@ -0,0 +1,41 @@
+/********************************************************************************
+    Advent of Code 2024 - day-24
+********************************************************************************/
+
+package main
+
+import (
+	"embed"
+	"flag"
+	"fmt"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	problems "github.com/onyx-and-iris/aoc2024/day-24"
+)
+
+//go:embed testdata
+var files embed.FS
+
+func main() {
+	filename := flag.String("f", "input.txt", "input file")
+	loglevel := flag.Int("l", int(log.InfoLevel), "log level")
+	flag.Parse()
+
+	if slices.Contains(log.AllLevels, log.Level(*loglevel)) {
+		log.SetLevel(log.Level(*loglevel))
+	}
+
+	data, err := files.ReadFile(fmt.Sprintf("testdata/%s", *filename))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	one, two, err := problems.Solve(data)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("solution one: %d\nsolution two: %d\n", one, two)
+}

day-24/go.mod

@@ -0,0 +1,7 @@
+module github.com/onyx-and-iris/aoc2024/day-24
+
+go 1.23.3
+
+require github.com/sirupsen/logrus v1.9.3
+
+require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect

day-24/go.sum

@@ -0,0 +1,15 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

day-24/internal/one/expression.go

@@ -0,0 +1,16 @@
+package one
+
+const (
+	AND = '&'
+	OR  = '|'
+	XOR = '^'
+)
+
+type expression struct {
+	left, right, target string
+	op                  rune
+}
+
+func newExpression(left, right, target string, op rune) expression {
+	return expression{left, right, target, op}
+}

day-24/internal/one/solve.go

@@ -0,0 +1,64 @@
+package one
+
+import (
+	"bytes"
+	"cmp"
+	"slices"
+	"strconv"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	initial, wires, expressions, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	for k, v := range initial {
+		wires[k] = v
+	}
+
+	wires = calculateWire(expressions, wires)
+
+	zWires := []zWire{}
+	for k, v := range wires {
+		if strings.HasPrefix(k, "z") {
+			zWires = append(zWires, zWire{k, v})
+		}
+	}
+	slices.SortFunc(zWires, func(a, b zWire) int {
+		return cmp.Compare(b.name, a.name)
+	})
+
+	var binStr strings.Builder
+	for _, zWire := range zWires {
+		binStr.WriteString(strconv.FormatInt(int64(zWire.value), 2))
+	}
+	log.Debug(binStr.String())
+
+	return mustConvBinToDec(binStr.String()), nil
+}
+
+func calculateWire(expressions []expression, wires map[string]int) map[string]int {
+	if !anyNegative(wires) {
+		return wires
+	}
+
+	for _, expression := range expressions {
+		if wires[expression.left] != noValue && wires[expression.right] != noValue {
+			switch expression.op {
+			case AND:
+				wires[expression.target] = wires[expression.left] & wires[expression.right]
+			case OR:
+				wires[expression.target] = wires[expression.left] | wires[expression.right]
+			case XOR:
+				wires[expression.target] = wires[expression.left] ^ wires[expression.right]
+			}
+		}
+	}
+
+	return calculateWire(expressions, wires)
+}

day-24/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-24/internal/one/util.go

@@ -0,0 +1,84 @@
+package one
+
+import (
+	"bufio"
+	"io"
+	"strconv"
+	"strings"
+)
+
+const (
+	left = iota * 2
+	right
+	target
+)
+
+func parseLines(r io.Reader) (map[string]int, map[string]int, []expression, error) {
+	initial := make(map[string]int)
+	wires := make(map[string]int)
+	expressions := []expression{}
+
+	var inGates bool
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if line == "" {
+			inGates = true
+			continue
+		}
+
+		if inGates {
+			parts := strings.Split(line, " ")
+
+			wires[parts[left]] = noValue
+			wires[parts[right]] = noValue
+			wires[parts[target]] = noValue
+
+			var op rune
+			switch parts[1] {
+			case "AND":
+				op = AND
+			case "OR":
+				op = OR
+			case "XOR":
+				op = XOR
+			}
+			expressions = append(expressions, newExpression(parts[left], parts[right], parts[target], op))
+		} else {
+			parts := strings.Split(line, ": ")
+			initial[parts[0]] = mustConv(parts[1])
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, nil, nil, err
+	}
+
+	return initial, wires, expressions, nil
+}
+
+func mustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func anyNegative(wires map[string]int) bool {
+	for _, v := range wires {
+		if v == -1 {
+			return true
+		}
+	}
+	return false
+}
+
+func mustConvBinToDec(s string) int {
+	n, err := strconv.ParseInt(s, 2, 64)
+	if err != nil {
+		panic(err)
+	}
+	return int(n)
+}

day-24/internal/one/zwire.go

@@ -0,0 +1,8 @@
+package one
+
+const noValue = -1
+
+type zWire struct {
+	name  string
+	value int
+}

day-24/makefile

@@ -0,0 +1,30 @@
+program = day-24
+
+GO = go
+SRC_DIR := src
+BIN_DIR := bin
+
+EXE := $(BIN_DIR)/$(program)
+
+.DEFAULT_GOAL := build
+
+.PHONY: fmt vet build bench clean
+fmt:        
+	$(GO) fmt ./...
+
+vet: fmt        
+	$(GO) vet ./...
+
+build: vet | $(BIN_DIR)
+	$(GO) build -o $(EXE) ./$(SRC_DIR)
+
+bench:
+	$(GO) test ./internal/one/ -bench=. > internal/one/benchmark
+	$(GO) test ./internal/two/ -bench=. > internal/two/benchmark
+	$(GO) test . -count=10 -bench=. > benchmark
+
+$(BIN_DIR):
+	@mkdir -p $@
+
+clean:
+	@rm -rv $(BIN_DIR)

day-24/solve.go

@@ -0,0 +1,20 @@
+package daytwentyfour
+
+import (
+	"github.com/onyx-and-iris/aoc2024/day-24/internal/one"
+	"github.com/onyx-and-iris/aoc2024/day-24/internal/two"
+)
+
+func Solve(buf []byte) (int, int, error) {
+	answerOne, err := one.Solve(buf)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	answerTwo, err := two.Solve(buf)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return answerOne, answerTwo, nil
+}

day-24/solve_internal_test.go

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