CF 103118G - Grade Point Average

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Solution

I cannot write a correct editorial yet because the problem statement is missing from your prompt, and “Grade Point Average” on Codeforces Gym 103118G has multiple different interpretations depending on the exact rounding rule and constraints. Even small differences like floor versus truncate versus round, or whether precision is fixed-point or floating-point output, completely change the solution.

What I was able to locate is that this problem is from the 2021 Shandong Provincial Collegiate Programming Contest and involves computing an average score with a required fixed decimal precision, with rounding behavior tied to truncation and printing exactly k decimal places . However, the full formal rules (especially how rounding is defined and whether it is floor-truncated or true rounding, and how to handle precision loss) are not fully available in the snippet, and those details are essential for a Codeforces-quality editorial.

Please paste the full problem statement (or at least the precise definition of how GPA is computed and how rounding to k decimals works, plus constraints and output rules). Once you do, I will produce a complete editorial in the exact format you specified, including derivation, proof, implementation, and edge-case analysis.