add day-10 + benchmarks

.gitignore

@@ -26,7 +26,7 @@ go.work.sum
 .env
 
 # input files
-**/testdata/*.txt
+**/testdata/*
 
 # scaffold
 mkfiles.sh

day-09/benchmark

@@ -0,0 +1,15 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-09
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	       1	22886096949 ns/op
+BenchmarkSolve-12    	       1	22884217914 ns/op
+BenchmarkSolve-12    	       1	22924853520 ns/op
+BenchmarkSolve-12    	       1	23014082753 ns/op
+BenchmarkSolve-12    	       1	22788595898 ns/op
+BenchmarkSolve-12    	       1	22781925171 ns/op
+BenchmarkSolve-12    	       1	23094890275 ns/op
+BenchmarkSolve-12    	       1	22694434858 ns/op
+BenchmarkSolve-12    	       1	23002190907 ns/op
+BenchmarkSolve-12    	       1	22923138789 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-09	229.003s

day-09/cmd/cli/main.go

@@ -0,0 +1,41 @@
+/********************************************************************************
+    Advent of Code 2024 - day-09
+********************************************************************************/
+
+package main
+
+import (
+	"embed"
+	"flag"
+	"fmt"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	problems "github.com/onyx-and-iris/aoc2024/day-09"
+)
+
+//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-09/go.mod

@@ -0,0 +1,7 @@
+module github.com/onyx-and-iris/aoc2024/day-09
+
+go 1.23.3
+
+require github.com/sirupsen/logrus v1.9.3
+
+require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect

day-09/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-09/internal/one/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-09/internal/one
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.1535 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-09/internal/one	1.893s

day-09/internal/one/block.go

@@ -0,0 +1,8 @@
+package one
+
+const empty = -1
+
+type block struct {
+	used int
+	free int
+}

day-09/internal/one/disk.go

@@ -0,0 +1,59 @@
+package one
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+)
+
+type disk struct {
+	data      []int
+	totalUsed int
+}
+
+func newDisk(blocks []block) disk {
+	var totalUsed int
+	data := []int{}
+	for id, block := range blocks {
+		for range block.used {
+			data = append(data, id)
+		}
+		for range block.free {
+			data = append(data, empty)
+		}
+		totalUsed += block.used
+	}
+
+	return disk{
+		data:      data,
+		totalUsed: totalUsed,
+	}
+}
+
+func (d *disk) len() int {
+	return d.totalUsed
+}
+
+func (d *disk) sort() {
+	for i := len(d.data) - 1; i >= 0; i-- {
+		if d.data[i] != empty {
+			indx := slices.Index(d.data, empty)
+			if indx == d.len() {
+				break
+			}
+			d.data[i], d.data[indx] = d.data[indx], d.data[i]
+		}
+	}
+}
+
+func (d *disk) debug() string {
+	var sb strings.Builder
+	for _, n := range d.data {
+		if n == empty {
+			sb.WriteRune('.')
+		} else {
+			sb.WriteString(fmt.Sprintf("%d", n))
+		}
+	}
+	return sb.String()
+}

day-09/internal/one/solve.go

@@ -0,0 +1,27 @@
+package one
+
+import (
+	"bytes"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	blocks, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	disk := newDisk(blocks)
+	disk.sort()
+	log.Debug(disk.debug())
+
+	var i, checksum int
+	for range disk.len() {
+		checksum += i * disk.data[i]
+		i++
+	}
+
+	return checksum, nil
+}

day-09/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-09/internal/one/util.go

@@ -0,0 +1,38 @@
+package one
+
+import (
+	"bufio"
+	"io"
+	"strconv"
+)
+
+func parseLines(r io.Reader) ([]block, error) {
+	var blocks []block
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		for i := 0; i < len(line); i += 2 {
+			var free int
+			if i < len(line)-1 {
+				free = mustConv(string(line[i+1]))
+			}
+			blocks = append(blocks, block{mustConv(string(line[i])), free})
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return []block{}, err
+	}
+
+	return blocks, nil
+}
+
+func mustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}

day-09/internal/two/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-09/internal/two
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	       1	22722704246 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-09/internal/two	22.726s

day-09/internal/two/block.go

@@ -0,0 +1,21 @@
+package two
+
+const empty = -1
+
+type block struct {
+	used   int
+	free   []int
+	offset int
+}
+
+func newBlock(used, start, end int) block {
+	return block{
+		used:   used,
+		free:   []int{start, start + end},
+		offset: 0,
+	}
+}
+
+func (b *block) available() int {
+	return b.free[1] - b.free[0]
+}

day-09/internal/two/disk.go

@@ -0,0 +1,98 @@
+package two
+
+import (
+	"fmt"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+)
+
+type disk struct {
+	blocks []block
+	data   []int
+}
+
+func newDisk(blocks []block) disk {
+	offset := 0
+	data := []int{}
+	for id, block := range blocks {
+		blocks[id].offset = offset
+		for range block.used {
+			data = append(data, id)
+		}
+		for range block.available() {
+			data = append(data, empty)
+		}
+		offset += block.used + block.available()
+	}
+
+	return disk{
+		blocks: blocks,
+		data:   data,
+	}
+}
+
+func (d *disk) sort() {
+	for i := len(d.blocks) - 1; i >= 0; i-- {
+		log.Debugf("searching for space for block %d of size %d\n", i, d.blocks[i].used)
+
+		for j := 0; j < len(d.data); j++ {
+			if j >= d.blocks[i].offset+d.blocks[i].used {
+				break
+			}
+
+			if d.data[j] != empty {
+				continue
+			}
+
+			var sz int
+			if d.data[j] == empty {
+				sz = d.sizeOfEmptyBlock(j)
+			}
+
+			if d.blocks[i].used <= sz {
+				d.writeBlockToDisk(j, d.blocks[i])
+				// don't attempt to write block again
+				break
+			}
+
+			// skip to end of empty block
+			j += sz
+		}
+	}
+}
+
+func (d *disk) sizeOfEmptyBlock(j int) int {
+	var sz int
+	for k := j; k < len(d.data) && d.data[k] == empty; k++ {
+		sz++
+	}
+	log.Debugf("found empty space of size %d\n", sz)
+	return sz
+}
+
+func (d *disk) writeBlockToDisk(start int, b block) {
+	for i := b.offset; i < b.offset+b.used; i, start = i+1, start+1 {
+		d.data[start] = d.data[i]
+		log.Debugf("writing %d to disk at pos %d\n", d.data[i], start)
+	}
+
+	for i := b.offset; i < len(d.data) && i < b.offset+b.used; i++ {
+		d.data[i] = empty
+		log.Debugf("truncating space on disk at pos %d", i)
+	}
+
+	log.Debug(d.debug())
+}
+
+func (d *disk) debug() string {
+	var sb strings.Builder
+	for _, n := range d.data {
+		if n == empty {
+			sb.WriteRune('.')
+		} else {
+			sb.WriteString(fmt.Sprintf("%d", n))
+		}
+	}
+	return sb.String()
+}

day-09/internal/two/solve.go

@@ -0,0 +1,31 @@
+package two
+
+import (
+	"bytes"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	blocks, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	disk := newDisk(blocks)
+	log.Debug(disk.debug())
+	disk.sort()
+	log.Debug(disk.debug())
+
+	var checksum int
+	for i := 0; i < len(disk.data); i++ {
+		if disk.data[i] == empty {
+			continue
+		}
+
+		checksum += i * disk.data[i]
+	}
+
+	return checksum, nil
+}

day-09/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)
+}

day-09/internal/two/util.go

@@ -0,0 +1,41 @@
+package two
+
+import (
+	"bufio"
+	"io"
+	"strconv"
+)
+
+func parseLines(r io.Reader) ([]block, error) {
+	var blocks []block
+	var start int
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		for i := 0; i < len(line); i += 2 {
+			used := mustConv(string(line[i]))
+			start += used
+			var end int
+			if i < len(line)-1 {
+				end = mustConv(string(line[i+1]))
+			}
+			blocks = append(blocks, newBlock(used, start, end))
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return []block{}, err
+	}
+
+	return blocks, nil
+}
+
+func mustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}

day-09/makefile

@@ -0,0 +1,30 @@
+program = day-09
+
+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-09/solve.go

@@ -0,0 +1,20 @@
+package daynine
+
+import (
+	"github.com/onyx-and-iris/aoc2024/day-09/internal/one"
+	"github.com/onyx-and-iris/aoc2024/day-09/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-09/solve_internal_test.go

@@ -0,0 +1,15 @@
+package daynine
+
+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-10/benchmark

@@ -0,0 +1,15 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-10
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.002208 ns/op
+BenchmarkSolve-12    	1000000000	         0.002135 ns/op
+BenchmarkSolve-12    	1000000000	         0.002113 ns/op
+BenchmarkSolve-12    	1000000000	         0.002273 ns/op
+BenchmarkSolve-12    	1000000000	         0.002123 ns/op
+BenchmarkSolve-12    	1000000000	         0.002133 ns/op
+BenchmarkSolve-12    	1000000000	         0.002054 ns/op
+BenchmarkSolve-12    	1000000000	         0.002107 ns/op
+BenchmarkSolve-12    	1000000000	         0.002664 ns/op
+BenchmarkSolve-12    	1000000000	         0.002081 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-10	0.167s

day-10/cmd/cli/main.go

@@ -0,0 +1,41 @@
+/********************************************************************************
+    Advent of Code 2024 - day-10
+********************************************************************************/
+
+package main
+
+import (
+	"embed"
+	"flag"
+	"fmt"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	problems "github.com/onyx-and-iris/aoc2024/day-10"
+)
+
+//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-10/go.mod

@@ -0,0 +1,7 @@
+module github.com/onyx-and-iris/aoc2024/day-10
+
+go 1.23.3
+
+require github.com/sirupsen/logrus v1.9.3
+
+require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect

day-10/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-10/internal/one/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-10/internal/one
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.001398 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-10/internal/one	0.014s

day-10/internal/one/direction.go

@@ -0,0 +1,9 @@
+package one
+
+const (
+	N = iota
+	E
+	S
+	W
+	None
+)

day-10/internal/one/graph.go

@@ -0,0 +1,40 @@
+package one
+
+import (
+	"slices"
+	"strings"
+)
+
+type point struct {
+	x int
+	y int
+}
+
+type graph struct {
+	data           []string
+	startPositions []point
+}
+
+func newGrid() *graph {
+	return &graph{data: make([]string, 0), startPositions: make([]point, 0)}
+}
+
+func (g *graph) String() string {
+	return strings.Join(g.data, "\n")
+}
+
+func (g *graph) isOutOfBounds(p point) bool {
+	return p.x < 0 || p.y < 0 || p.y >= len(g.data) || p.x >= len(g.data[p.y])
+}
+
+func (g *graph) valueAt(p point) rune {
+	return rune(g.data[p.y][p.x])
+}
+
+func (g *graph) debug(path []point) string {
+	temp := slices.Clone(g.data)
+	for _, pos := range path {
+		temp[pos.y] = replaceAtIndex(temp[pos.y], '+', pos.x)
+	}
+	return strings.Join(temp, "\n")
+}

day-10/internal/one/neighbours.go

@@ -0,0 +1,10 @@
+package one
+
+func neighbours(p point) [4]point {
+	return [4]point{
+		{p.x, p.y - 1},
+		{p.x + 1, p.y},
+		{p.x, p.y + 1},
+		{p.x - 1, p.y},
+	}
+}

day-10/internal/one/solve.go

@@ -0,0 +1,68 @@
+package one
+
+import (
+	"bytes"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/onyx-and-iris/aoc2024/day-10/internal/queue"
+)
+
+const target = '9'
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	graph, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	var totalScore int
+	queue := queue.New[point]()
+	for _, pos := range graph.startPositions {
+		if graph.isOutOfBounds(pos) {
+			continue
+		}
+		queue.Enqueue(pos)
+
+		var score int
+		visited := make(map[point]struct{})
+		endpoints := make(map[point]struct{})
+		for !queue.IsEmpty() {
+			current := queue.Dequeue()
+
+			_, ok := endpoints[current]
+			if ok {
+				continue
+			}
+			endpoints[current] = struct{}{}
+
+			if graph.valueAt(current) == target {
+				score++
+				continue
+			}
+
+			_, ok = visited[current]
+			if ok {
+				continue
+			}
+			visited[current] = struct{}{}
+
+			for _, n := range neighbours(current) {
+				if graph.isOutOfBounds(n) {
+					continue
+				}
+
+				if graph.valueAt(n)-graph.valueAt(current) == 1 {
+					log.Tracef("pushing %v with value %s back onto the queue\n", n, string(graph.valueAt(n)))
+					queue.Enqueue(n)
+				}
+			}
+		}
+
+		log.Debugf("score for trailhead %v - %d\n", pos, score)
+		totalScore += score
+	}
+
+	return totalScore, nil
+}

day-10/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-10/internal/one/util.go

@@ -0,0 +1,45 @@
+package one
+
+import (
+	"bufio"
+	"io"
+	"regexp"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var reStartPos = regexp.MustCompile(`0`)
+
+func parseLines(r io.Reader) (*graph, error) {
+	graph := newGrid()
+
+	var linecount int
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		graph.data = append(graph.data, line)
+		for _, m := range reStartPos.FindAllStringIndex(line, -1) {
+			graph.startPositions = append(
+				graph.startPositions,
+				point{x: m[0], y: linecount},
+			)
+		}
+
+		linecount++
+	}
+
+	log.Debug(graph.startPositions)
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return graph, nil
+}
+
+func replaceAtIndex(s string, r rune, i int) string {
+	out := []rune(s)
+	out[i] = r
+	return string(out)
+}

day-10/internal/queue/queue.go

@@ -0,0 +1,39 @@
+package queue
+
+import "sync"
+
+type ConcurrentQueue[T comparable] struct {
+	items []T
+	lock  sync.Mutex
+	cond  *sync.Cond
+}
+
+func New[T comparable]() *ConcurrentQueue[T] {
+	q := &ConcurrentQueue[T]{}
+	q.cond = sync.NewCond(&q.lock)
+	return q
+}
+
+func (q *ConcurrentQueue[T]) Enqueue(item T) {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	q.items = append(q.items, item)
+	q.cond.Signal()
+}
+
+func (q *ConcurrentQueue[T]) Dequeue() T {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	for len(q.items) == 0 {
+		q.cond.Wait()
+	}
+	item := q.items[0]
+	q.items = q.items[1:]
+	return item
+}
+
+func (q *ConcurrentQueue[T]) IsEmpty() bool {
+	return len(q.items) == 0
+}

day-10/internal/two/benchmark

@@ -0,0 +1,6 @@
+goos: linux
+goarch: amd64
+pkg: github.com/onyx-and-iris/aoc2024/day-10/internal/two
+cpu: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
+BenchmarkSolve-12    	1000000000	         0.0009003 ns/op
+ok  	github.com/onyx-and-iris/aoc2024/day-10/internal/two	0.012s

day-10/internal/two/direction.go

@@ -0,0 +1,9 @@
+package two
+
+const (
+	N = iota
+	E
+	S
+	W
+	None
+)

day-10/internal/two/graph.go

@@ -0,0 +1,41 @@
+package two
+
+import (
+	"slices"
+	"strings"
+)
+
+type point struct {
+	x         int
+	y         int
+	direction int
+}
+
+type graph struct {
+	data           []string
+	startPositions []point
+}
+
+func newGrid() *graph {
+	return &graph{data: make([]string, 0), startPositions: make([]point, 0)}
+}
+
+func (g *graph) String() string {
+	return strings.Join(g.data, "\n")
+}
+
+func (g *graph) isOutOfBounds(p point) bool {
+	return p.x < 0 || p.y < 0 || p.y >= len(g.data) || p.x >= len(g.data[p.y])
+}
+
+func (g *graph) valueAt(p point) rune {
+	return rune(g.data[p.y][p.x])
+}
+
+func (g *graph) debug(path []point) string {
+	temp := slices.Clone(g.data)
+	for _, pos := range path {
+		temp[pos.y] = replaceAtIndex(temp[pos.y], '+', pos.x)
+	}
+	return strings.Join(temp, "\n")
+}

day-10/internal/two/neighbours.go

@@ -0,0 +1,10 @@
+package two
+
+func neighbours(p point) [4]point {
+	return [4]point{
+		{p.x, p.y - 1, N},
+		{p.x + 1, p.y, E},
+		{p.x, p.y + 1, S},
+		{p.x - 1, p.y, W},
+	}
+}

day-10/internal/two/solve.go

@@ -0,0 +1,58 @@
+package two
+
+import (
+	"bytes"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/onyx-and-iris/aoc2024/day-10/internal/queue"
+)
+
+const target = '9'
+
+func Solve(buf []byte) (int, error) {
+	r := bytes.NewReader(buf)
+	graph, err := parseLines(r)
+	if err != nil {
+		return 0, err
+	}
+
+	var totalScore int
+	queue := queue.New[point]()
+	for _, pos := range graph.startPositions {
+		if graph.isOutOfBounds(pos) {
+			continue
+		}
+		queue.Enqueue(pos)
+
+		var score int
+		for !queue.IsEmpty() {
+			current := queue.Dequeue()
+
+			if graph.valueAt(current) == target {
+				score++
+				continue
+			}
+
+			for dir, n := range neighbours(current) {
+				if graph.isOutOfBounds(n) {
+					continue
+				}
+
+				if n.direction == None {
+					n.direction = dir
+				}
+
+				if graph.valueAt(n)-graph.valueAt(current) == 1 {
+					log.Tracef("pushing %v with value %s back onto the queue\n", n, string(graph.valueAt(n)))
+					queue.Enqueue(n)
+				}
+			}
+		}
+
+		log.Debugf("score for trailhead %v - %d\n", pos, score)
+		totalScore += score
+	}
+
+	return totalScore, nil
+}

day-10/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)
+}

day-10/internal/two/util.go

@@ -0,0 +1,45 @@
+package two
+
+import (
+	"bufio"
+	"io"
+	"regexp"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var reStartPos = regexp.MustCompile(`0`)
+
+func parseLines(r io.Reader) (*graph, error) {
+	graph := newGrid()
+
+	var linecount int
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		graph.data = append(graph.data, line)
+		for _, m := range reStartPos.FindAllStringIndex(line, -1) {
+			graph.startPositions = append(
+				graph.startPositions,
+				point{x: m[0], y: linecount, direction: None},
+			)
+		}
+
+		linecount++
+	}
+
+	log.Debug(graph.startPositions)
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return graph, nil
+}
+
+func replaceAtIndex(s string, r rune, i int) string {
+	out := []rune(s)
+	out[i] = r
+	return string(out)
+}

day-10/makefile

@@ -0,0 +1,30 @@
+program = day-10
+
+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-10/solve.go

@@ -0,0 +1,20 @@
+package dayten
+
+import (
+	"github.com/onyx-and-iris/aoc2024/day-10/internal/one"
+	"github.com/onyx-and-iris/aoc2024/day-10/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-10/solve_internal_test.go

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