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  1. str = 'jkAkklkBkljBlkjjlkjljAmlkjAlkjBljk'
  2. primary = 'A'
  3. opposite = 'B'
  4. min = str.size
  5. index = -1
  6.  
  7. str.each_char.each_with_index do |c, i|
  8.   index = i if c == primary
  9.  
  10.   if c == opposite
  11.     if index == -1
  12.       index = i
  13.     else
  14.       min = [min, i - index].min
  15.       index = i
  16.       primary, opposite = opposite, primary
  17.     end
  18.   end
  19. end
  20.  
  21. p min
Success #stdin #stdout 0.05s 9648KB
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https://ideone.com/zpjOcT
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
public

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