Editorial for CERC '07 B - Strange Billboard
Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.
Submitting an official solution before solving the problem yourself is a bannable offence.
- 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.
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