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116 lines
2.5 KiB
Ruby
116 lines
2.5 KiB
Ruby
=begin
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File: graph_adjacency_list.rb
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Created Time: 2024-04-25
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Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
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=end
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require_relative '../utils/vertex'
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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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attr_reader :adj_list
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### 构造方法 ###
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def initialize(edges)
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# 邻接表，key：顶点，value：该顶点的所有邻接顶点
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@adj_list = {}
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# 添加所有顶点和边
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for edge in edges
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add_vertex(edge[0])
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add_vertex(edge[1])
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add_edge(edge[0], edge[1])
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end
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end
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### 获取顶点数量 ###
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def size
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@adj_list.length
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end
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### 添加边 ###
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def add_edge(vet1, vet2)
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raise ArgumentError if !@adj_list.include?(vet1) || !@adj_list.include?(vet2)
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@adj_list[vet1] << vet2
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@adj_list[vet2] << vet1
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end
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### 删除边 ###
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def remove_edge(vet1, vet2)
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raise ArgumentError if !@adj_list.include?(vet1) || !@adj_list.include?(vet2)
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# 删除边 vet1 - vet2
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@adj_list[vet1].delete(vet2)
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@adj_list[vet2].delete(vet1)
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end
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### 添加顶点 ###
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def add_vertex(vet)
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return if @adj_list.include?(vet)
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# 在邻接表中添加一个新链表
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@adj_list[vet] = []
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end
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### 删除顶点 ###
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def remove_vertex(vet)
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raise ArgumentError unless @adj_list.include?(vet)
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# 在邻接表中删除顶点 vet 对应的链表
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@adj_list.delete(vet)
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# 遍历其他顶点的链表，删除所有包含 vet 的边
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for vertex in @adj_list
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@adj_list[vertex.first].delete(vet) if @adj_list[vertex.first].include?(vet)
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end
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end
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### 打印邻接表 ###
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def __print__
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puts '邻接表 ='
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for vertex in @adj_list
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tmp = @adj_list[vertex.first].map { |v| v.val }
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puts "#{vertex.first.val}: #{tmp},"
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end
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end
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end
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### Driver Code ###
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if __FILE__ == $0
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# 初始化无向图
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v = vals_to_vets([1, 3, 2, 5, 4])
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edges = [
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[v[0], v[1]],
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[v[0], v[3]],
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[v[1], v[2]],
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[v[2], v[3]],
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[v[2], v[4]],
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[v[3], v[4]],
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]
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graph = GraphAdjList.new(edges)
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puts "\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 v[0]，v[2]
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graph.add_edge(v[0], v[2])
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puts "\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 v[0]，v[1]
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graph.remove_edge(v[0], v[1])
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puts "\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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v5 = Vertex.new(6)
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graph.add_vertex(v5)
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puts "\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 v[1]
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graph.remove_vertex(v[1])
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puts "\n删除顶点 3 后，图为"
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graph.__print__
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end
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