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  1. visits = %w[
  2.   CS
  3.   CA
  4.   SOB
  5.   ABO
  6.   OBD
  7.   LDO
  8.   AOL
  9. ]
  10. result = {}
  11. visits.each do |visit|
  12.   chars = visit.chars
  13.   chars.each do |char|
  14.     result[char] ||= []
  15.     result[char] += chars - [char]
  16.   end
  17. end
  18. result.each do |k, v|
  19.   puts '%s: %s' % [k, v.join(', ')]
  20. end
  21.  
Success #stdin #stdout 0.01s 6440KB
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stdin
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Standard input is empty
stdout
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C: S, A
S: C, O, B
A: C, B, O, O, L
O: S, B, A, B, B, D, L, D, A, L
B: S, O, A, O, O, D
D: O, B, L, O
L: D, O, A, O
https://ideone.com/AzX1Y6
language:
Ruby (ruby 2.5.5)
created:
4 years ago
visibility:
public

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