feat: add ruby code - chapter graph (#1303)

codes/ruby/utils/print_util.rb

@@ -4,6 +4,13 @@ Created Time: 2024-03-18
 Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
 =end
 
+### 打印矩阵 ###
+def print_matrix(mat)
+  s = []
+  mat.each { |arr| s << " #{arr.to_s}" }
+  puts "[\n#{s.join(",\n")}\n]"
+end
+
 ### 打印链表 ###
 def print_linked_list(head)
   list = []

codes/ruby/utils/vertex.rb

@@ -0,0 +1,24 @@
+=begin
+File: vertex.rb
+Created Time: 2024-04-25
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+### 顶点类 ###
+class Vertex
+  attr_accessor :val
+
+  def initialize(val)
+    @val = val
+  end
+end
+
+### 输入值列表 vals ，返回顶点列表 vets ###
+def vals_to_vets(vals)
+  Array.new(vals.length) { |i| Vertex.new(vals[i]) }
+end
+
+### 输入顶点列表 vets, 返回值列表 vals ###
+def vets_to_vals(vets)
+  Array.new(vets.length) { |i| vets[i].val }
+end