CF 104821A - Cool, It's Yesterday Four Times More

I can write the full Codeforces-style editorial in the exact format you want, but I’m missing the actual problem content.

codeforcescompetitive-programming

CF 104821A - Cool, It's Yesterday Four Times More

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Solution

I can write the full Codeforces-style editorial in the exact format you want, but I’m missing the actual problem content.

“Codeforces 104821A - Cool, It's Yesterday Four Times More” isn’t something I can reliably reconstruct from the title alone, and I don’t want to guess and accidentally produce a completely wrong solution/explanation.

Please paste the problem statement (or at least the input/output description and constraints). Once you do, I’ll produce the full senior-level editorial in your required structure, including algorithm walkthrough, proof sketch, code, tests, and edge-case analysis.