mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-25 15:36:29 +08:00
54 lines
1.3 KiB
Ruby
54 lines
1.3 KiB
Ruby
=begin
|
||
File: graph_dfs.rb
|
||
Created Time: 2024-04-25
|
||
Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
|
||
=end
|
||
|
||
require 'set'
|
||
require_relative './graph_adjacency_list'
|
||
require_relative '../utils/vertex'
|
||
|
||
### 深度优先遍历辅助函数 ###
|
||
def dfs(graph, visited, res, vet)
|
||
res << vet # 记录访问顶点
|
||
visited.add(vet) # 标记该顶点已被访问
|
||
# 遍历该顶点的所有邻接顶点
|
||
for adj_vet in graph.adj_list[vet]
|
||
next if visited.include?(adj_vet) # 跳过已被访问的顶点
|
||
# 递归访问邻接顶点
|
||
dfs(graph, visited, res, adj_vet)
|
||
end
|
||
end
|
||
|
||
### 深度优先遍历 ###
|
||
def graph_dfs(graph, start_vet)
|
||
# 使用邻接表来表示图，以便获取指定顶点的所有邻接顶点
|
||
# 顶点遍历序列
|
||
res = []
|
||
# 哈希表，用于记录已被访问过的顶点
|
||
visited = Set.new
|
||
dfs(graph, visited, res, start_vet)
|
||
res
|
||
end
|
||
|
||
### Driver Code ###
|
||
if __FILE__ == $0
|
||
# 初始化无向图
|
||
v = vals_to_vets([0, 1, 2, 3, 4, 5, 6])
|
||
edges = [
|
||
[v[0], v[1]],
|
||
[v[0], v[3]],
|
||
[v[1], v[2]],
|
||
[v[2], v[5]],
|
||
[v[4], v[5]],
|
||
[v[5], v[6]],
|
||
]
|
||
graph = GraphAdjList.new(edges)
|
||
puts "\n初始化后，图为"
|
||
graph.__print__
|
||
|
||
# 深度优先遍历
|
||
res = graph_dfs(graph, v[0])
|
||
puts "\n深度优先遍历（DFS）顶点序列为"
|
||
p vets_to_vals(res)
|
||
end
|