2022_12: golang solution(part 1)

.vscode/launch.json

@@ -1,9 +1,13 @@
 {
-	// Use IntelliSense to learn about possible attributes.
-	// Hover to view descriptions of existing attributes.
-	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
 	"version": "0.2.0",
 	"configurations": [
+		{
+			"name": "Day 12 golang",
+			"type": "go",
+			"request": "launch",
+			"mode": "debug",
+			"program": "${workspaceFolder}/2022/day_12/golang/main.go"
+		},
 		{
 			"type": "lldb",
 			"request": "launch",

2022/day_12/golang/go.mod

@@ -0,0 +1,3 @@
+module github.com/MellKam/advent_of_code/2022/day_12/golang
+
+go 1.19

2022/day_12/golang/graph/bfs.go

@@ -0,0 +1,41 @@
+package graph
+
+type BFSNode struct {
+	vertex   *Vertex
+	distance int
+}
+
+func GetShortestPath(startVertex *Vertex, endCoords Coords) int {
+	visited := make(map[Coords]bool)
+	queue := make([]BFSNode, 0)
+
+	queue = append(queue, BFSNode{vertex: startVertex, distance: 0})
+	visited[startVertex.Key()] = true
+
+	for len(queue) > 0 {
+		node := queue[0]
+		queue = queue[1:]
+
+		key := node.vertex.Key()
+		if endCoords.Equal(&key) {
+			return node.distance
+		}
+
+		nextNeighbour := node.vertex.Iter()
+		for {
+			neighbour := nextNeighbour()
+			if neighbour == nil {
+				break
+			}
+
+			key = neighbour.Key()
+
+			if !visited[key] {
+				queue = append(queue, BFSNode{vertex: neighbour, distance: node.distance + 1})
+				visited[key] = true
+			}
+		}
+	}
+
+	return -1
+}

2022/day_12/golang/graph/coords.go

@@ -0,0 +1,28 @@
+package graph
+
+import "fmt"
+
+type Coords struct {
+	x uint
+	y uint
+}
+
+func (c *Coords) Equal(c2 *Coords) bool {
+	return c.x == c2.x && c.y == c2.y
+}
+
+func (c *Coords) String() string {
+	return fmt.Sprintf("x: %d, y: %d", c.x, c.y)
+}
+
+func NewCoords(x uint, y uint) Coords {
+	return Coords{x: x, y: y}
+}
+
+func (c *Coords) X() uint {
+	return c.x
+}
+
+func (c *Coords) Y() uint {
+	return c.y
+}

2022/day_12/golang/graph/graph.go

@@ -0,0 +1,69 @@
+package graph
+
+import "fmt"
+
+type Graph struct {
+	veritces []*Vertex
+	Height   uint
+	Width    uint
+}
+
+func (g *Graph) AddVertex(vertex Vertex) error {
+	if g.ContainsKey(&vertex.key) {
+		return fmt.Errorf("vertex with key {%v} already exists", vertex.key.String())
+	}
+
+	g.veritces = append(g.veritces, &vertex)
+	return nil
+}
+
+func (g *Graph) GetVertex(coords Coords) *Vertex {
+	for _, v := range g.veritces {
+		if v.key.Equal(&coords) {
+			return v
+		}
+	}
+
+	return nil
+}
+
+func (g *Graph) ContainsKey(coords *Coords) bool {
+	for _, v := range g.veritces {
+		if v.key.Equal(coords) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (g *Graph) String() string {
+	s := "Graph {\n"
+	for i, vertex := range g.veritces {
+		if i > 0 {
+			s += ",\n"
+		}
+		s += fmt.Sprintf("	%v", vertex.String())
+
+	}
+	return s + "\n}"
+}
+
+func (g *Graph) Iter() func() *Vertex {
+	var index = 0
+	var length = len(g.veritces)
+
+	return func() *Vertex {
+		if index >= length {
+			return nil
+		}
+
+		v := g.veritces[index]
+		index++
+		return v
+	}
+}
+
+func (g *Graph) Len() int {
+	return len(g.veritces)
+}

2022/day_12/golang/graph/vertex.go

@@ -0,0 +1,51 @@
+package graph
+
+import "fmt"
+
+type Vertex struct {
+	key       Coords
+	value     byte
+	adjacents []*Vertex
+}
+
+func NewVertex(key Coords, value byte) Vertex {
+	return Vertex{key: key, value: value}
+}
+
+func (v *Vertex) AddEdge(v2 *Vertex) {
+	v.adjacents = append(v.adjacents, v2)
+}
+
+func (v *Vertex) Key() Coords {
+	return v.key
+}
+
+func (v *Vertex) Value() byte {
+	return v.value
+}
+
+func (v *Vertex) String() string {
+	s := fmt.Sprintf("Vertex[%v] {", v.key.String())
+	for i, vertex := range v.adjacents {
+		if i > 0 {
+			s += ", "
+		}
+		s += fmt.Sprintf("{%v}", vertex.key.String())
+	}
+	return s + "}"
+}
+
+func (v *Vertex) Iter() func() *Vertex {
+	var index = 0
+	var length = len(v.adjacents)
+
+	return func() *Vertex {
+		if index >= length {
+			return nil
+		}
+
+		v := v.adjacents[index]
+		index++
+		return v
+	}
+}

2022/day_12/golang/main.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/MellKam/advent_of_code/2022/day_12/golang/graph"
+)
+
+func main() {
+	data, err := os.ReadFile("./2022/day_12/input.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	g, startCoords, endCoords := FillGraph(string(data))
+
+	startVertex := g.GetVertex(startCoords)
+	if startVertex == nil {
+		panic("startVertex is nil")
+	}
+
+	shortestPath := graph.GetShortestPath(startVertex, endCoords)
+
+	fmt.Println(shortestPath)
+}
+
+func FillGraph(data string) (graph.Graph, graph.Coords, graph.Coords) {
+	var startCoords graph.Coords
+	var endCoords graph.Coords
+
+	lines := strings.Split(data, "\n")
+	height := len(lines)
+	width := len(lines[0])
+
+	g := graph.Graph{Width: uint(width), Height: uint(height)}
+
+	for y, line := range lines {
+		for x, char := range line {
+			var vertex graph.Vertex
+			coords := graph.NewCoords(uint(x), uint(y))
+			var value byte
+
+			if char == 'S' {
+				// "S" => start point (elevation 'a')
+				value = byte('a')
+				startCoords = coords
+			} else if char == 'E' {
+				// "E" => end point (elevation 'z')
+				value = byte('z')
+				endCoords = coords
+			} else {
+				value = byte(char)
+			}
+
+			vertex = graph.NewVertex(coords, value-96)
+			err := g.AddVertex(vertex)
+			if err != nil {
+				panic(err)
+			}
+		}
+	}
+
+	nextVertex := g.Iter()
+
+	for {
+		vertex := nextVertex()
+
+		if vertex == nil {
+			break
+		}
+
+		coords := vertex.Key()
+
+		left := g.GetVertex(graph.NewCoords(coords.X()-1, coords.Y()))
+		right := g.GetVertex(graph.NewCoords(coords.X()+1, coords.Y()))
+		top := g.GetVertex(graph.NewCoords(coords.X(), coords.Y()-1))
+		bottom := g.GetVertex(graph.NewCoords(coords.X(), coords.Y()+1))
+
+		ConnectVertexesByTarget(vertex, left)
+		ConnectVertexesByTarget(vertex, right)
+		ConnectVertexesByTarget(vertex, top)
+		ConnectVertexesByTarget(vertex, bottom)
+	}
+
+	return g, startCoords, endCoords
+}
+
+func ConnectVertexesByTarget(v1 *graph.Vertex, v2 *graph.Vertex) {
+	if v2 == nil {
+		return
+	}
+
+	if int(v2.Value())-int(v1.Value()) <= 1 {
+		v1.AddEdge(v2)
+	}
+}

2022/day_12/input.txt

@@ -0,0 +1,41 @@
+abcccccccccccccccccaaaaaaaaccccccacccaaccccccccccccccccccaaaaaaaaaacccccccccccccccccccccccccccccccaaaaaaccccccccccccccccccccccccccccccccccaaaaa
+abccccccccccccccccccaaaaacccccccaaaaaaacccccccccccaaccaaaaaaaaaaaaaccccccccccccccccccccccccccccccccaaaaacccccccccccccccccccccccccccccccccaaaaaa
+abccccccccccccaaccccaaaaaacccccccaaaaaaaaccccccacaaaccaaaaaaaaaaaaaaaccccccccccccccccccaaacccccccaaaaaaaccccccccccccccccaaaccccccccccccccaaaaaa
+abccccccccacccaaccccaaaaaacccccccaaaaaaaaaccccaaaaaaaaacaaaaaaaaaaaaacccccccccccccccccccaacccccccaaaaaaaacccccccccccccccaaaccccccccccccccaccaaa
+abaacccccaaaaaaaccccaaaccacccccccaaaaaaaaaccccaaaaaaaaccccaaaaaaaaaaaccccccccccccccccaacaaaaaccccaaaaaaaacccccccccccccccaaacccccccccccccccccaaa
+abaaccccccaaaaaaaacccccccccccccccaaaaaaaaccccccaaaaaacccccaaaacaaaaccccccccccccccccccaaaaaaaaccccccaaacaccccccccccccccccaaakccaaaccccccccccccaa
+abaaacccccaaaaaaaaaccccccccccccccaaaaaaacccccccaaaaaccccccaaaccaaaaccccccccccccaacacccaaaaaccccccccaaacccccccccccccacacckkkkkkkaacccccccccccccc
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+abaccccccccaaccccccccccaaaaaacccaacaaccaaaaaaaaaccccccccccccccccccccccccaaaaaaccccccccccccccccccccccccccaaaachhhqqtttxwyyyyyywvrqqqmmmmdddccccc
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+abaccccccccaaaacccccccccccccccccaaaaaaccccaaaaaaaacccccaaaaaaccaacaaacccccccccccccaaccaaaaaaaaccccccccccccccchhpppssssssssrwwwwrrrnneeecaaccccc
+abaccccccccaaaacccccccccccccccccccaaaccccaaaaaaaaacccccaaaaaaccaaaaaccccccccccccccccccccaaaaacccccccccccccccchhpppssssssssrrrwrrrnnneeeaaaccccc
+abcccccccccaaaacccccccccccccccccccccccccaaaaaaaaaaccccccaaaaacccaaaaaacccccccccccccccccaaaaaacccccccccccccccchhpppppsssooorrrrrrrnnneeeaaaccccc
+abcccccccccaaaccccccccccccccccccccccccccaaacaaacccccccccaacaacaaaaaaaacccccccccccccccccaaaaaacaaccccccccccccchhhppppppoooooorrrrnnneeeaaaaacccc
+abccccccccccccccccccccccccccccccccccccccccccaaaccaaaacccccccccaaaaacaaccccaacccccccccacaaaaaacaaccccccccccccchhhgpppppoooooooonnnnneeeaaaaacccc
+abcccccccaacccccccccccccccccccccccccccccccccaaacaaaaaccccccccccacaaaccccccaacccccccccaacaaaaaaaaaaacccccaaccccgggggggggggfooooonnneeeeaaaaacccc
+abcccccccaaacaaccccccccccccaacccccccccccccccccccaaaaaaccccaacccccaaacccaaaaaaaaccccccaaaaacaaaaaaaaccccaaacccccggggggggggfffooonneeeecaaacccccc
+abcccccccaaaaaaccccaacccccaaacccccccccccccccccccaaaaaaccccaaaccccccccccaaaaaaaacccccccaaaaaccaaaaccccaaaaaaaacccggggggggfffffffffeeeecaaccccccc
+abcccccaaaaaaaccaaaaacaaaaaaacccccccccccccccccccaaaaacccccaaaacccaaccccccaaaacccccccaaaaaaaacaaaaacccaaaaaaaaccccccccccaaaffffffffecccccccccccc
+abcaaacaaaaaaacccaaaaaaaaaaaaaaaccccccccccccccccccaaacccccaaaacaaaacaacccaaaaaccccccaaaaaaaaaaaaaaccccaaaaaacccccccccccaaacaafffffccccccccccaaa
+abaaaacccaaaaaaccaaaaacaaaaaaaaaccccccccccccaaacccccccccccaaaaaaaaacaaccaaacaacccccccccaacccaaccaaccccaaaaaaccccccccccaaaaccaaacccccccccccccaaa
+abaaaacccaacaaacaaaaacccaaaaaaacccccccccccccaaaacccccccccaaaaaaaaaaaaaccaacccacccccccccaacccccccccccccaaaaaaccccccccccaaacccccccccccccccccccaaa
+abcaaacccaacccccccaaaccaaaaaacccccccccccccccaaaaccccccaaaaaaaaaaaaaaaaaaccccccccccccccccccccccccccccccaaccaaccccccccccaaaccccccccccccccccaaaaaa
+abcccccccccccccccccccccaaaaaaaccccccccccccccaaacccccccaaaaaaaaaaaaaaaaaacccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccaaaaaa

2022/day_12/map.txt

@@ -0,0 +1,41 @@
+...................aaaaaaaa......acccaa..................aaaaaaaaaa...............................aaaaaa..................................aaaaa
+....................aaaaa.......aaaaaaa...........aa..aaaaaaaaaaaaa................................aaaaa.................................aaaaaa
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