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feat: add Swift codes for graph_operations article (#327)
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nuomi1
GitHub
parent
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commit
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5 changed files with 434 additions and 0 deletions
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@ -28,6 +28,8 @@ let package = Package(
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.executable(name: "binary_search_tree", targets: ["binary_search_tree"]),
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.executable(name: "avl_tree", targets: ["avl_tree"]),
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.executable(name: "my_heap", targets: ["my_heap"]),
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.executable(name: "graph_adjacency_matrix", targets: ["graph_adjacency_matrix"]),
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.executable(name: "graph_adjacency_list", targets: ["graph_adjacency_list"]),
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.executable(name: "linear_search", targets: ["linear_search"]),
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.executable(name: "binary_search", targets: ["binary_search"]),
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.executable(name: "hashing_search", targets: ["hashing_search"]),
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@ -62,6 +64,8 @@ let package = Package(
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.executableTarget(name: "binary_search_tree", dependencies: ["utils"], path: "chapter_tree", sources: ["binary_search_tree.swift"]),
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.executableTarget(name: "avl_tree", dependencies: ["utils"], path: "chapter_tree", sources: ["avl_tree.swift"]),
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.executableTarget(name: "my_heap", dependencies: ["utils"], path: "chapter_heap", sources: ["my_heap.swift"]),
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.executableTarget(name: "graph_adjacency_matrix", dependencies: ["utils"], path: "chapter_graph", sources: ["graph_adjacency_matrix.swift"]),
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.executableTarget(name: "graph_adjacency_list", path: "chapter_graph", sources: ["graph_adjacency_list.swift"]),
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.executableTarget(name: "linear_search", dependencies: ["utils"], path: "chapter_searching", sources: ["linear_search.swift"]),
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.executableTarget(name: "binary_search", path: "chapter_searching", sources: ["binary_search.swift"]),
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.executableTarget(name: "hashing_search", dependencies: ["utils"], path: "chapter_searching", sources: ["hashing_search.swift"]),
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138
codes/swift/chapter_graph/graph_adjacency_list.swift
Normal file
138
codes/swift/chapter_graph/graph_adjacency_list.swift
Normal file
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@ -0,0 +1,138 @@
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/**
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* File: graph_adjacency_list.swift
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* Created Time: 2023-02-01
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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/* 顶点类 */
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class Vertex: Hashable {
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var val: Int
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init(val: Int) {
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self.val = val
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}
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static func == (lhs: Vertex, rhs: Vertex) -> Bool {
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lhs.val == rhs.val
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}
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func hash(into hasher: inout Hasher) {
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hasher.combine(val)
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}
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}
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/* 基于邻接表实现的无向图类 */
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class GraphAdjList {
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// 请注意，vertices 和 adjList 中存储的都是 Vertex 对象
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private var adjList: [Vertex: Set<Vertex>] // 邻接表（使用哈希表实现）
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init(edges: [[Vertex]]) {
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adjList = [:]
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// 添加所有顶点和边
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for edge in edges {
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addVertex(vet: edge[0])
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addVertex(vet: edge[1])
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addEdge(vet1: edge[0], vet2: edge[1])
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}
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}
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/* 获取顶点数量 */
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func size() -> Int {
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adjList.count
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}
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/* 添加边 */
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func addEdge(vet1: Vertex, vet2: Vertex) {
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if adjList[vet1] == nil || adjList[vet2] == nil || vet1 == vet2 {
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fatalError("参数错误")
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}
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// 添加边 vet1 - vet2
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adjList[vet1]?.insert(vet2)
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adjList[vet2]?.insert(vet1)
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}
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/* 删除边 */
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func removeEdge(vet1: Vertex, vet2: Vertex) {
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if adjList[vet1] == nil || adjList[vet2] == nil || vet1 == vet2 {
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fatalError("参数错误")
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}
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// 删除边 vet1 - vet2
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adjList[vet1]?.remove(vet2)
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adjList[vet2]?.remove(vet1)
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}
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/* 添加顶点 */
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func addVertex(vet: Vertex) {
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if adjList[vet] != nil {
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return
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}
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// 在邻接表中添加一个新链表（即 HashSet）
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adjList[vet] = []
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}
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/* 删除顶点 */
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func removeVertex(vet: Vertex) {
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if adjList[vet] == nil {
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fatalError("参数错误")
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}
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// 在邻接表中删除顶点 vet 对应的链表（即 HashSet）
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adjList.removeValue(forKey: vet)
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// 遍历其它顶点的链表（即 HashSet），删除所有包含 vet 的边
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for key in adjList.keys {
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adjList[key]?.remove(vet)
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}
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}
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/* 打印邻接表 */
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func print() {
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Swift.print("邻接表 =")
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for entry in adjList {
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var tmp: [Int] = []
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for vertex in entry.value {
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tmp.append(vertex.val)
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}
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Swift.print("\(entry.key.val): \(tmp),")
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}
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}
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}
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@main
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enum GraphAdjacencyList {
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/* Driver Code */
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static func main() {
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/* 初始化无向图 */
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let v0 = Vertex(val: 1)
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let v1 = Vertex(val: 3)
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let v2 = Vertex(val: 2)
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let v3 = Vertex(val: 5)
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let v4 = Vertex(val: 4)
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let edges = [[v0, v1], [v1, v2], [v2, v3], [v0, v3], [v2, v4], [v3, v4]]
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let graph = GraphAdjList(edges: edges)
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print("\n初始化后，图为")
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graph.print()
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/* 添加边 */
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// 顶点 1, 2 即 v0, v2
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graph.addEdge(vet1: v0, vet2: v2)
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print("\n添加边 1-2 后，图为")
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graph.print()
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/* 删除边 */
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// 顶点 1, 3 即 v0, v1
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graph.removeEdge(vet1: v0, vet2: v1)
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print("\n删除边 1-3 后，图为")
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graph.print()
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/* 添加顶点 */
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let v5 = Vertex(val: 6)
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graph.addVertex(vet: v5)
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print("\n添加顶点 6 后，图为")
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graph.print()
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/* 删除顶点 */
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// 顶点 3 即 v1
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graph.removeVertex(vet: v1)
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print("\n删除顶点 3 后，图为")
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graph.print()
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}
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}
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130
codes/swift/chapter_graph/graph_adjacency_matrix.swift
Normal file
130
codes/swift/chapter_graph/graph_adjacency_matrix.swift
Normal file
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@ -0,0 +1,130 @@
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/**
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* File: graph_adjacency_matrix.swift
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* Created Time: 2023-02-01
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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import utils
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/* 基于邻接矩阵实现的无向图类 */
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class GraphAdjMat {
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private var vertices: [Int] // 顶点列表，元素代表“顶点值”，索引代表“顶点索引”
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private var adjMat: [[Int]] // 邻接矩阵，行列索引对应“顶点索引”
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/* 构造函数 */
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init(vertices: [Int], edges: [[Int]]) {
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self.vertices = []
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adjMat = []
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// 添加顶点
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for val in vertices {
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addVertex(val: val)
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}
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// 添加边
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// 请注意，edges 元素代表顶点索引，即对应 vertices 元素索引
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for e in edges {
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addEdge(i: e[0], j: e[1])
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}
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}
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/* 获取顶点数量 */
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func size() -> Int {
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vertices.count
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}
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/* 添加顶点 */
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func addVertex(val: Int) {
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let n = size()
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// 向顶点列表中添加新顶点的值
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vertices.append(val)
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// 在邻接矩阵中添加一行
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let newRow = Array(repeating: 0, count: n)
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adjMat.append(newRow)
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// 在邻接矩阵中添加一列
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for i in adjMat.indices {
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adjMat[i].append(0)
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}
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}
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/* 删除顶点 */
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func removeVertex(index: Int) {
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if index >= size() {
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fatalError("越界")
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}
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// 在顶点列表中移除索引 index 的顶点
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vertices.remove(at: index)
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// 在邻接矩阵中删除索引 index 的行
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adjMat.remove(at: index)
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// 在邻接矩阵中删除索引 index 的列
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for i in adjMat.indices {
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adjMat[i].remove(at: index)
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}
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}
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/* 添加边 */
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// 参数 i, j 对应 vertices 元素索引
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func addEdge(i: Int, j: Int) {
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// 索引越界与相等处理
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if i < 0 || j < 0 || i >= size() || j >= size() || i == j {
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fatalError("越界")
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}
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// 在无向图中，邻接矩阵沿主对角线对称，即满足 (i, j) == (j, i)
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adjMat[i][j] = 1
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adjMat[j][i] = 1
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}
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/* 删除边 */
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// 参数 i, j 对应 vertices 元素索引
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func removeEdge(i: Int, j: Int) {
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// 索引越界与相等处理
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if i < 0 || j < 0 || i >= size() || j >= size() || i == j {
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fatalError("越界")
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}
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adjMat[i][j] = 0
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adjMat[j][i] = 0
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}
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/* 打印邻接矩阵 */
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func print() {
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Swift.print("顶点列表 = ", terminator: "")
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Swift.print(vertices)
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Swift.print("邻接矩阵 =")
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PrintUtil.printMatrix(matrix: adjMat)
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}
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}
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@main
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enum GraphAdjacencyMatrix {
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/* Driver Code */
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static func main() {
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/* 初始化无向图 */
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// 请注意，edges 元素代表顶点索引，即对应 vertices 元素索引
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let vertices = [1, 3, 2, 5, 4]
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let edges = [[0, 1], [0, 2], [1, 2], [2, 3], [0, 3], [2, 4], [3, 4]]
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let graph = GraphAdjMat(vertices: vertices, edges: edges)
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print("\n初始化后，图为")
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graph.print()
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/* 添加边 */
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// 顶点 1, 2 的索引分别为 0, 2
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graph.addEdge(i: 0, j: 2)
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print("\n添加边 1-2 后，图为")
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graph.print()
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/* 删除边 */
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// 顶点 1, 3 的索引分别为 0, 1
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graph.removeEdge(i: 0, j: 1)
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print("\n删除边 1-3 后，图为")
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graph.print()
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/* 添加顶点 */
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graph.addVertex(val: 6)
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print("\n添加顶点 6 后，图为")
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graph.print()
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/* 删除顶点 */
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// 顶点 3 的索引为 1
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graph.removeVertex(index: 1)
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print("\n删除顶点 3 后，图为")
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graph.print()
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}
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}
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@ -82,4 +82,12 @@ public enum PrintUtil {
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let root = TreeNode.listToTree(list: queue)
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printTree(root: root)
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}
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public static func printMatrix<T>(matrix: [[T]]) {
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print("[")
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for row in matrix {
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print(" \(row),")
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}
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print("]")
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}
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}
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@ -159,7 +159,83 @@ comments: true
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=== "Swift"
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```swift title="graph_adjacency_matrix.swift"
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/* 基于邻接矩阵实现的无向图类 */
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class GraphAdjMat {
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private var vertices: [Int] // 顶点列表，元素代表“顶点值”，索引代表“顶点索引”
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private var adjMat: [[Int]] // 邻接矩阵，行列索引对应“顶点索引”
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/* 构造函数 */
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init(vertices: [Int], edges: [[Int]]) {
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self.vertices = []
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adjMat = []
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// 添加顶点
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for val in vertices {
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addVertex(val: val)
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}
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// 添加边
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// 请注意，edges 元素代表顶点索引，即对应 vertices 元素索引
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for e in edges {
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addEdge(i: e[0], j: e[1])
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}
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}
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/* 获取顶点数量 */
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func size() -> Int {
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vertices.count
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}
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/* 添加顶点 */
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func addVertex(val: Int) {
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let n = size()
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// 向顶点列表中添加新顶点的值
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vertices.append(val)
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// 在邻接矩阵中添加一行
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let newRow = Array(repeating: 0, count: n)
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adjMat.append(newRow)
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// 在邻接矩阵中添加一列
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for i in adjMat.indices {
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adjMat[i].append(0)
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}
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}
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/* 删除顶点 */
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func removeVertex(index: Int) {
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if index >= size() {
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fatalError("越界")
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}
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// 在顶点列表中移除索引 index 的顶点
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vertices.remove(at: index)
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// 在邻接矩阵中删除索引 index 的行
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adjMat.remove(at: index)
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// 在邻接矩阵中删除索引 index 的列
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for i in adjMat.indices {
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adjMat[i].remove(at: index)
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}
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}
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/* 添加边 */
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// 参数 i, j 对应 vertices 元素索引
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func addEdge(i: Int, j: Int) {
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// 索引越界与相等处理
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if i < 0 || j < 0 || i >= size() || j >= size() || i == j {
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fatalError("越界")
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}
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// 在无向图中，邻接矩阵沿主对角线对称，即满足 (i, j) == (j, i)
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adjMat[i][j] = 1
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adjMat[j][i] = 1
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}
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/* 删除边 */
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// 参数 i, j 对应 vertices 元素索引
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func removeEdge(i: Int, j: Int) {
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// 索引越界与相等处理
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if i < 0 || j < 0 || i >= size() || j >= size() || i == j {
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fatalError("越界")
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}
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adjMat[i][j] = 0
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adjMat[j][i] = 0
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}
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}
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```
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=== "Zig"
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@ -312,7 +388,85 @@ comments: true
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=== "Swift"
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```swift title="graph_adjacency_list.swift"
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/* 顶点类 */
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class Vertex: Hashable {
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var val: Int
|
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|
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init(val: Int) {
|
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self.val = val
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}
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static func == (lhs: Vertex, rhs: Vertex) -> Bool {
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lhs.val == rhs.val
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}
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func hash(into hasher: inout Hasher) {
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hasher.combine(val)
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}
|
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}
|
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|
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/* 基于邻接表实现的无向图类 */
|
||||
class GraphAdjList {
|
||||
// 请注意，vertices 和 adjList 中存储的都是 Vertex 对象
|
||||
private var adjList: [Vertex: Set<Vertex>] // 邻接表（使用哈希表实现）
|
||||
|
||||
init(edges: [[Vertex]]) {
|
||||
adjList = [:]
|
||||
// 添加所有顶点和边
|
||||
for edge in edges {
|
||||
addVertex(vet: edge[0])
|
||||
addVertex(vet: edge[1])
|
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addEdge(vet1: edge[0], vet2: edge[1])
|
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}
|
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}
|
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|
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/* 获取顶点数量 */
|
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func size() -> Int {
|
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adjList.count
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}
|
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|
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/* 添加边 */
|
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func addEdge(vet1: Vertex, vet2: Vertex) {
|
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if adjList[vet1] == nil || adjList[vet2] == nil || vet1 == vet2 {
|
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fatalError("参数错误")
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}
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// 添加边 vet1 - vet2
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adjList[vet1]?.insert(vet2)
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adjList[vet2]?.insert(vet1)
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}
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/* 删除边 */
|
||||
func removeEdge(vet1: Vertex, vet2: Vertex) {
|
||||
if adjList[vet1] == nil || adjList[vet2] == nil || vet1 == vet2 {
|
||||
fatalError("参数错误")
|
||||
}
|
||||
// 删除边 vet1 - vet2
|
||||
adjList[vet1]?.remove(vet2)
|
||||
adjList[vet2]?.remove(vet1)
|
||||
}
|
||||
|
||||
/* 添加顶点 */
|
||||
func addVertex(vet: Vertex) {
|
||||
if adjList[vet] != nil {
|
||||
return
|
||||
}
|
||||
// 在邻接表中添加一个新链表（即 HashSet）
|
||||
adjList[vet] = []
|
||||
}
|
||||
|
||||
/* 删除顶点 */
|
||||
func removeVertex(vet: Vertex) {
|
||||
if adjList[vet] == nil {
|
||||
fatalError("参数错误")
|
||||
}
|
||||
// 在邻接表中删除顶点 vet 对应的链表（即 HashSet）
|
||||
adjList.removeValue(forKey: vet)
|
||||
// 遍历其它顶点的链表（即 HashSet），删除所有包含 vet 的边
|
||||
for key in adjList.keys {
|
||||
adjList[key]?.remove(vet)
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
=== "Zig"
|
||||
|
|
|
|||
Loading…
Reference in a new issue