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  1.  
  2. F=
  3. ->input{
  4.  
  5. rows = input.split'
  6. '
  7. node = Struct.new :incoming_connection_count, :next_node
  8.  
  9. nodes = Hash.new{|h,k|h[k] = node.new 0}
  10.  
  11. rows.size.times{|y|
  12.   x=0
  13.   rows[y].chars{|c|
  14.     case c
  15.     when ?>
  16.       from = [y,x-4]
  17.       to = [y,x+2]
  18.     when ?<
  19.       from = [y,x+4]
  20.       to = [y,x-2]     
  21.     when ?^
  22.       from = [y+3,x]
  23.       to = [y-1,x]
  24.     when ?v
  25.       from = [y-3,x]
  26.       to = [y+1,x]
  27.     end
  28.  
  29.     if from
  30.       nodes[from].next_node = nodes[to]
  31.       nodes[to].incoming_connection_count += 1
  32.     end
  33.  
  34.     x+=1
  35.   }
  36. }
  37.  
  38. current = nodes.values.find{|n|n.incoming_connection_count < 1}
  39. loop_start = nodes.values.find{|n|n.incoming_connection_count > 1}
  40.  
  41. unless loop_start
  42.   # no loop; adjust the total node count
  43.   [nodes.size-1, 0]
  44. else
  45.   # there's a loop; measure length of the tail
  46.   tail = 0
  47.   (tail+=1;current = current.next_node) while current!=loop_start
  48.   [tail, nodes.size-tail]
  49. end
  50.  
  51. }
  52.  
  53. require 'minitest/autorun'
  54.  
  55. describe F do
  56.  
  57.   def test_simple_case
  58.     assert_equal [2, 6], F[<<-DOC]
  59. # --> # --> # --> #
  60. ^     ^           |
  61. |     |           |
  62. |     |           v
  63. #     # <-- # <-- #
  64. DOC
  65.   end
  66.  
  67.   def test_harder_case
  68.     assert_equal [3, 10], F[<<-DOC]
  69.             # --> # --> #
  70.             ^           |
  71.             |           |
  72.             |           v
  73.       # --> # <-- #     # --> #
  74.       ^           ^           |
  75.       |           |           |
  76.       |           |           v
  77. # --> #           # <-- # <-- #
  78. DOC
  79.   end
  80.  
  81.   def test_no_loop
  82.     assert_equal [6, 0], F[<<-DOC]
  83. # --> # --> # --> #
  84.                   |
  85.                   |
  86.                   v
  87.         <-- # <-- #
  88. DOC
  89.   end
  90.  
  91. end
Success #stdin #stdout 0.08s 10728KB
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Standard input is empty
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Run options: --seed 23398

# Running tests:

...

Finished tests in 0.001623s, 1848.1089 tests/s, 1848.1089 assertions/s.

3 tests, 3 assertions, 0 failures, 0 errors, 0 skips
https://ideone.com/xCvRd0
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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