chore: add day25 part 1

aoc2023/day21/main.go

@@ -10,7 +10,7 @@ import (
 
 // var log = aoc.Log
 
-func main() { aoc.MustResult(aoc.Runner(run)) }
+func main() { aoc.MustResult(aoc.Runner(runner(64))) }
 
 type result struct {
 	valuePT1 int
@@ -19,12 +19,81 @@ type result struct {
 
 func (r result) String() string { return fmt.Sprintf("%#v", r) }
 
-func run(scan *bufio.Scanner) (*result, error) {
+func runner(rounds int) func(scan *bufio.Scanner) (*result, error) {
+	return func(scan *bufio.Scanner) (*result, error) {
+		var garden garden
 
-	for scan.Scan() {
-		_ = scan.Text()
+		for scan.Scan() {
+			txt := scan.Text()
+			garden.m = append(garden.m, []rune(txt))
 
+			for i, c := range txt {
+				if c == 'S' {
+					garden.start[0] = len(garden.m) - 1
+					garden.start[1] = i
+				}
+			}
+		}
+		garden.Step(rounds)
+		return &result{
+			valuePT1: len(garden.steps[len(garden.steps)-1]),
+		}, nil
+	}
+}
+
+type garden struct {
+	start aoc.Point[int]
+	m     [][]rune
+	steps []aoc.Set[aoc.Point[int]]
+}
+
+func (g *garden) Neighbors(p aoc.Point[int]) []aoc.Point[int] {
+	var neighbors []aoc.Point[int]
+	for _, n := range []aoc.Point[int]{
+		{p[0] - 1, p[1]},
+		{p[0] + 1, p[1]},
+		{p[0], p[1] - 1},
+		{p[0], p[1] + 1},
+	} {
+		if n[0] >= 0 && n[0] < len(g.m) && n[1] >= 0 && n[1] < len(g.m[0]) && g.m[n[0]][n[1]] != '#' {
+			neighbors = append(neighbors, n)
+		}
+	}
+	return neighbors
+}
+
+func (g *garden) Step(n int) {
+	if len(g.steps) == 0 {
+		g.steps = append(g.steps, aoc.NewSet(g.start))
 	}
 
-	return &result{}, nil
+	for step := range(n) {
+		g.steps = append(g.steps, aoc.NewSet[aoc.Point[int]]())
+		for p := range g.steps[step] {
+			for _, n := range g.Neighbors(p) {
+				g.steps[step+1].Add(n)
+			}
+		}
+	}
 }
+
+func (g garden) String() string {
+	var b []rune
+	for i, line := range g.m {
+		if i == g.start[0] {
+			line[g.start[1]] = 'X'
+		}
+
+		if steps := len(g.steps) - 1; steps > 0 {	
+			for p := range g.steps[len(g.steps)-1] {
+				if p[0] == i {
+					line[p[1]] = 'O'
+				}
+			}
+		}
+
+		b = append(b, line...)
+		b = append(b, '\n')
+	}
+	return string(b)
+}

aoc2023/day21/main_test.go

@@ -20,11 +20,11 @@ func TestExample(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(example))
 
-	result, err := run(scan)
+	result, err := runner(6)(scan)
 	is.NoErr(err)
 
 	t.Log(result)
-	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT1, 16)
 	is.Equal(result.valuePT2, 0)
 }
 
@@ -32,10 +32,10 @@ func TestSolution(t *testing.T) {
 	is := is.New(t)
 	scan := bufio.NewScanner(bytes.NewReader(input))
 
-	result, err := run(scan)
+	result, err := runner(64)(scan)
 	is.NoErr(err)
 
 	t.Log(result)
-	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT1, 3709)
 	is.Equal(result.valuePT2, 0)
 }

aoc2023/day25/example.txt

@@ -0,0 +1,13 @@
+jqt: rhn xhk nvd
+rsh: frs pzl lsr
+xhk: hfx
+cmg: qnr nvd lhk bvb
+rhn: xhk bvb hfx
+bvb: xhk hfx
+pzl: lsr hfx nvd
+qnr: nvd
+ntq: jqt hfx bvb xhk
+nvd: lhk
+lsr: lhk
+rzs: qnr cmg lsr rsh
+frs: qnr lhk lsr

aoc2023/day25/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"bufio"
+	_ "embed"
+	"fmt"
+	"iter"
+	"strings"
+
+	aoc "go.sour.is/advent-of-code"
+)
+
+// var log = aoc.Log
+
+func main() { aoc.MustResult(aoc.Runner(run)) }
+
+type result struct {
+	valuePT1 int
+	valuePT2 int
+}
+
+func (r result) String() string { return fmt.Sprintf("%#v", r) }
+
+func run(scan *bufio.Scanner) (*result, error) {
+	g := aoc.Graph[string, int]()
+	var root string
+
+	for scan.Scan() {
+		line := scan.Text()
+		v, lis, ok := strings.Cut(line, ": ")
+		if !ok {
+			continue
+		}
+
+		if root == "" {
+			root = v
+		}	
+
+		for _, l := range strings.Split(lis, " ") {
+			g.AddEdge(v, l, 1)
+			g.AddEdge(l, v, 1)
+
+		}
+	}
+
+	for i, v := range enumerate(g.BFS(root)) {
+		fmt.Println(i, v)
+	}
+
+	return &result{}, nil
+}
+
+func enumerate[T any](vs iter.Seq[T]) iter.Seq2[int, T] {
+	i := 0
+	return func(yield func(int, T) bool) {
+		for v := range vs {
+			if !yield(i, v) {
+				return
+			}
+			i++
+		}
+	}
+}	

aoc2023/day25/main_test.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+
+	_ "embed"
+
+	"github.com/matryer/is"
+)
+
+//go:embed example.txt
+var example []byte
+
+//go:embed input.txt
+var input []byte
+
+func TestExample(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(example))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 50)
+	is.Equal(result.valuePT2, 0)
+}
+
+func TestSolution(t *testing.T) {
+	is := is.New(t)
+	scan := bufio.NewScanner(bytes.NewReader(input))
+
+	result, err := run(scan)
+	is.NoErr(err)
+
+	t.Log(result)
+	is.Equal(result.valuePT1, 0)
+	is.Equal(result.valuePT2, 0)
+}

aoc_test.go

@@ -9,7 +9,6 @@ import (
 	aoc "go.sour.is/advent-of-code"
 )
 
-
 func TestList(t *testing.T) {
 	is := is.New(t)
 
@@ -56,7 +55,6 @@ func TestPriorityQueue(t *testing.T) {
 	is.True(v == nil)
 }
 
-
 func ExamplePriorityQueue() {
 	type memo struct {
 		pt    int
@@ -74,7 +72,7 @@ func ExamplePriorityQueue() {
 	}
 
 	pq := aoc.PriorityQueue(less)
-	visited := aoc.Set([]int{}...)
+	visited := aoc.NewSet([]int{}...)
 	dist := aoc.DefaultMap[int](int(^uint(0) >> 1))
 
 	dist.Set(0, 0)
@@ -117,25 +115,7 @@ func ExamplePriorityQueue() {
 	// point 5 is 22 steps away.
 	// point 6 is 19 steps away.
 }
-func TestGraph(t *testing.T) {
-	is := is.New(t)
 
-	var adjacencyList = map[int][]int{
-		2: {3, 5, 1},
-		1: {2, 4},
-		3: {6, 2},
-		4: {1, 5, 7},
-		5: {2, 6, 8, 4},
-		6: {3, 0, 9, 5},
-		7: {4, 8},
-		8: {5, 9, 7},
-		9: {6, 0, 8},
-	}
-
-	g := aoc.Graph(aoc.WithAdjacencyList[int, int](adjacencyList))
-	is.Equal(g.Neighbors(1), []int{2, 4})
-	is.Equal(map[int][]int(g.AdjacencyList()), adjacencyList)
-}
 
 func ExampleFibHeap() {
 	type memo struct {
@@ -154,7 +134,7 @@ func ExampleFibHeap() {
 	}
 
 	pq := aoc.FibHeap(less)
-	visited := aoc.Set([]int{}...)
+	visited := aoc.NewSet([]int{}...)
 	dist := aoc.DefaultMap[int](int(^uint(0) >> 1))
 
 	dist.Set(0, 0)

grids.go

@@ -3,6 +3,7 @@ package aoc
 import (
 	"cmp"
 	"fmt"
+	"iter"
 	"sort"
 	"strings"
 
@@ -156,10 +157,10 @@ func CompressMap[C number, N comparable](p pather[C, N], start N) pather[C, N] {
 	return &cmap[C, N]{base: p, neighbors: visited}
 }
 
-type adjacencyList[V any, C comparable] map[C][]V
-type graph[V any, W cmp.Ordered, C comparable] map[C]*vertex[V, W]
-type graphOption[V any, W cmp.Ordered, C comparable] func(g *graph[V, W, C])
-type vertex[V any, W cmp.Ordered] struct {
+type adjacencyList[V comparable] map[V][]V
+type graph[V comparable, W cmp.Ordered] map[V]*vertex[V, W]
+type graphOption[V comparable, W cmp.Ordered] func(g *graph[V, W])
+type vertex[V comparable, W cmp.Ordered] struct {
 	Value V
 	Edges edges[V, W]
 }
@@ -173,48 +174,48 @@ func (v *vertex[V, W]) Neighbors() []V {
 	return nbs
 }
 
-type edge[V any, W cmp.Ordered] struct {
+type edge[V comparable, W cmp.Ordered] struct {
 	Vertex *vertex[V, W]
 	Weight W
 }
-type edges[V any, W cmp.Ordered] []edge[V, W]
+type edges[V comparable, W cmp.Ordered] []edge[V, W]
 
 func (e edges[V, W]) Len() int           { return len(e) }
 func (e edges[V, W]) Less(i, j int) bool { return e[i].Weight < e[j].Weight }
 func (e edges[V, W]) Swap(i, j int)      { e[i], e[j] = e[j], e[i] }
 
-func Graph[V any, W cmp.Ordered, C comparable](opts ...graphOption[V, W, C]) *graph[V, W, C] {
-	g := make(graph[V, W, C])
+func Graph[V comparable, W cmp.Ordered](opts ...graphOption[V, W]) *graph[V, W] {
+	g := make(graph[V, W])
 	for _, opt := range opts {
 		opt(&g)
 	}
 	return &g
 }
-func (g *graph[V, W, C]) AddVertex(id C, value V) {
+func (g *graph[V, W]) AddVertex(id V, value V) {
 	(*g)[id] = &vertex[V, W]{Value: value}
 }
-func (g *graph[V, W, C]) AddEdge(from, to C, w W) {
+func (g *graph[V, W]) AddEdge(from, to V, w W) {
 	if g == nil {
 		return
 	}
 	if _, ok := (*g)[from]; !ok {
-		return
+		g.AddVertex(from, from)
 	}
 	if _, ok := (*g)[to]; !ok {
-		return
+		g.AddVertex(to, to)
 	}
 
 	(*g)[from].Edges = append((*g)[from].Edges, edge[V, W]{(*g)[to], w})
 }
-func (g *graph[V, W, C]) Neighbors(v C) []V {
+func (g *graph[V, W]) Neighbors(v V) []V {
 	if g == nil {
 		return nil
 	}
 
 	return (*g)[v].Neighbors()
 }
-func (g *graph[V, W, C]) AdjacencyList() adjacencyList[V, C] {
-	m := make(map[C][]V)
+func (g *graph[V, W]) AdjacencyList() adjacencyList[V] {
+	m := make(map[V][]V)
 	for id, v := range *g {
 		if len(v.Edges) == 0 {
 			continue
@@ -224,9 +225,9 @@ func (g *graph[V, W, C]) AdjacencyList() adjacencyList[V, C] {
 	return m
 }
 
-func WithAdjacencyList[W cmp.Ordered, C comparable](list adjacencyList[C, C]) graphOption[C, W, C] {
+func WithAdjacencyList[W cmp.Ordered, V comparable](list adjacencyList[V]) graphOption[V, W] {
 	var zeroW W
-	return func(g *graph[C, W, C]) {
+	return func(g *graph[V, W]) {
 		for vertex, edges := range list {
 			if _, ok := (*g)[vertex]; !ok {
 				g.AddVertex(vertex, vertex)
@@ -244,3 +245,53 @@ func WithAdjacencyList[W cmp.Ordered, C comparable](list adjacencyList[C, C]) gr
 		}
 	}
 }
+
+func (g *graph[V, W]) BFS(start V) iter.Seq[V] {
+	visited := make(map[V]bool)
+	stack := NewStack(start)
+
+	return func(yield func(V) bool) {
+		for !stack.IsEmpty() {
+			current := stack.Pull()
+			if visited[current] {
+				continue
+			}
+			visited[current] = true
+			if !yield(current) {
+				return
+			}
+			neighbors := g.Neighbors(current)
+			for _, n := range neighbors {
+				if !visited[n] {
+					stack.Push(n)
+				}
+			}
+		}
+	}
+}
+
+
+// DFS returns a sequence of vertices in depth-first order, starting at the
+// given vertex.
+func (g *graph[V, W]) DFS(start V) iter.Seq[V] {
+	visited := make(map[V]bool)
+	stack := NewStack(start)
+
+	return func(yield func(V) bool) {
+		for !stack.IsEmpty() {
+			current := stack.Pop()
+			if visited[current] {
+				continue
+			}
+			visited[current] = true
+			if !yield(current) {
+				return
+			}
+			for _, n := range Reverse(g.Neighbors(current)) {
+				if !visited[n] {
+					stack.Push(n)
+				}
+			}
+		}
+	}
+}

grids_test.go

@@ -0,0 +1,75 @@
+package aoc_test
+
+import (
+	"iter"
+	"testing"
+
+	"github.com/matryer/is"
+	aoc "go.sour.is/advent-of-code"
+)
+
+func TestGraph(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		2: {3, 5, 1},
+		1: {2, 4},
+		3: {6, 2},
+		4: {1, 5, 7},
+		5: {2, 6, 8, 4},
+		6: {3, 0, 9, 5},
+		7: {4, 8},
+		8: {5, 9, 7},
+		9: {6, 0, 8},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int](adjacencyList))
+	is.Equal(g.Neighbors(1), []int{2, 4})
+	is.Equal(map[int][]int(g.AdjacencyList()), adjacencyList)
+}
+
+func TestGraphDFS(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		2: {3, 5, 1},
+		1: {2, 4},
+		3: {6, 2},
+		4: {1, 5, 7},
+		5: {2, 6, 8, 4},
+		6: {3, 0, 9, 5},
+		7: {4, 8},
+		8: {5, 9, 7},
+		9: {6, 0, 8},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int](adjacencyList))
+	is.Equal(toList(g.DFS(6)), []int{6, 3, 2, 5, 8, 9, 0, 7, 4, 1})
+}
+
+func TestGraphBFS(t *testing.T) {
+	is := is.New(t)
+
+	var adjacencyList = map[int][]int{
+		2: {3, 5, 1},
+		1: {2, 4},
+		3: {6, 2},
+		4: {1, 5, 7},
+		5: {2, 6, 8, 4},
+		6: {3, 0, 9, 5},
+		7: {4, 8},
+		8: {5, 9, 7},
+		9: {6, 0, 8},
+	}
+
+	g := aoc.Graph(aoc.WithAdjacencyList[int](adjacencyList))
+	is.Equal(toList(g.BFS(6)), []int{6, 3, 0, 9, 5, 2, 8, 4, 1, 7})
+}
+
+func toList[T any](seq iter.Seq[T]) []T {
+	var list []T
+	for v := range seq {
+		list = append(list, v)
+	}
+	return list
+}

itertools_test.go

@@ -42,3 +42,16 @@ func TestTranspose(t *testing.T) {
 		},
 	)
 }
+
+func TestPairwise(t *testing.T) {
+	is := is.New(t)
+
+	is.Equal(
+		aoc.Pairwise([]int{1, 2, 3, 4}),
+		[][2]int{
+			{1, 2},
+			{2, 3},
+			{3, 4},
+		},
+	)
+}

math_test.go

@@ -31,3 +31,21 @@ func TestABS(t *testing.T) {
 	is.Equal(aoc.ABS(0), 0)
 	is.Equal(aoc.ABS(-1), 1)
 }
+
+func TestMin(t *testing.T) {
+	is := is.New(t)	
+
+	is.Equal(aoc.Min(10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10), 1)
+}
+
+func TestMax(t *testing.T) {
+	is := is.New(t)	
+
+	is.Equal(aoc.Max(1, 10, 2, 3, 4, 5, 6, 7, 8, 9, 1), 10)	
+}
+
+func TestSum(t *testing.T) {
+	is := is.New(t)	
+
+	is.Equal(aoc.Sum(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), 55)
+}

set.go

@@ -2,22 +2,22 @@ package aoc
 
 import "golang.org/x/exp/maps"
 
-type set[T comparable] map[T]struct{}
+type Set[T comparable] map[T]struct{}
 
-func Set[T comparable](arr ...T) set[T] {
-	m := make(set[T], len(arr))
+func NewSet[T comparable](arr ...T) Set[T] {
+	m := make(Set[T], len(arr))
 	for _, a := range arr {
 		m[a] = struct{}{}
 	}
 	return m
 }
-func (m *set[T]) Add(a T) {
+func (m *Set[T]) Add(a T) {
 	(*m)[a] = struct{}{}
 }
-func (m *set[T]) Items() []T {
+func (m *Set[T]) Items() []T {
 	return maps.Keys(*m)
 }
-func (m *set[T]) Has(a T) bool {
+func (m *Set[T]) Has(a T) bool {
 	var ok bool
 	_, ok = (*m)[a]
 	return ok

set_test.go

@@ -11,7 +11,7 @@ import (
 func TestSet(t *testing.T) {
 	is := is.New(t)
 
-	s := aoc.Set(1, 2, 3)
+	s := aoc.NewSet(1, 2, 3)
 	is.True(!s.Has(0))
 	is.True(s.Has(1))
 	is.True(s.Has(2))
@@ -24,4 +24,6 @@ func TestSet(t *testing.T) {
 	items := s.Items()
 	sort.Ints(items)
 	is.Equal(items, []int{1, 2, 3, 4})
+	is.True(aoc.In(4, items...))
+	is.True(!aoc.In(99, items...))
 }

stack.go

@@ -0,0 +1,64 @@
+package aoc
+
+type stack[T any] []T
+
+func NewStack[T any](items ...T) *stack[T] {
+	s := make(stack[T], len(items))
+	copy(s, items)
+	return &s
+}
+
+// Push adds an element to the top of the stack.
+func (s *stack[T]) Push(v T) {
+	*s = append(*s, v)
+}
+
+// Pop removes the top element from the stack and returns it.
+// If the stack is empty, it panics.
+func (s *stack[T]) Pop() T {
+	if s.IsEmpty() {
+		var zero T
+		return zero
+	}
+
+	v := (*s)[len(*s)-1]
+	*s = (*s)[:len(*s)-1]
+	return v
+}
+
+// Peek returns the top element from the stack without removing it.
+// If the stack is empty, it panics.
+func (s *stack[T]) Peek() T {
+	if s.IsEmpty() {
+		var zero T
+		return zero
+	}
+
+	return (*s)[len(*s)-1]
+}	
+
+// Len returns the number of elements in the stack.
+func (s *stack[T]) Len() int {
+	return len(*s)
+}	
+
+// IsEmpty returns true if the stack is empty and false otherwise.
+func (s *stack[T]) IsEmpty() bool {
+	return s == nil || len(*s) == 0
+}
+
+// Clear removes all elements from the stack, returning it to its initial state.
+func (s *stack[T]) Clear() {
+	*s = (*s)[:0]
+}
+
+func (s *stack[T]) Pull() T {
+	if s.IsEmpty() {
+		var zero T
+		return zero
+	}
+	v := (*s)[0]
+	*s = (*s)[1:]
+	return v
+}
+