Editorial for Mock CCC '19 Contest 1 S1 - Pusheen's Report Card

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.

This problem is a homage to CCC 2018 S1, which tripped up competitors who had trouble with rounding.

The two intended solutions were to use the standard rounding mechanism built-in to the languages, or to compute the average exactly and then print it properly.

For the subtask of N=1, it sufficed to print .0 after the only mark.

For the subtask of N=10, one could print the sum of all marks, divided by 10, followed by a decimal point, followed by the remainder of the above division.


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