Editorial for COCI '06 Contest 2 #1 R2

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.

By definition, the arithmetic mean is S=\frac{R_1+R_2} 2. Therefore, R_2=2S-R_1.


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