Editorial for CERC '07 B - Strange Billboard

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  • What if we somehow knew the tapped tiles in the first row?
  • We can try what happens with the row
  • WOW! It is easy to find the second one!
  • Let's also do it…
  • The third row becomes evident
  • … and so on
  • Ok, but how to find the first row?
  • We will try all possibilities!
  • Approx. 2^{16} \times 16^2

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