CF 105826K - Суммы и произведения

Sure. Please provide the Codeforces problem statement (or a link/name/contest ID), and I’ll write a detailed editorial in a competitive programming style.

codeforcescompetitive-programming

CF 105826K - \u0421\u0443\u043c\u043c\u044b \u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u044f

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Solve time: 1m 55s
Verified: no

Solution

Sure. Please provide the Codeforces problem statement (or a link/name/contest ID), and I’ll write a detailed editorial in a competitive programming style.

I can include:

  • Problem restatement
  • Key observations
  • Derivation of the algorithm
  • Proof of correctness
  • Complexity analysis
  • Implementation details
  • Reference C++17 solution (if you want)