CF 105904J - Joining Polynomials

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Solve time: 1m 57s
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Solution

Sure - please paste the Codeforces problem (statement + constraints, or a link + key details), and I’ll write a full competitive programming editorial for it.

I’ll structure it like a typical high-quality Codeforces editorial:

Problem summary (clear restatement)
Key observations / insights
Step-by-step idea development
Algorithm explanation
Proof of correctness
Complexity analysis
Edge cases
Reference implementation (C++/Python if you want)

Send the problem whenever you're ready.