CF 1058202023_1A - An Array and Several More Arrays

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Solve time: 28s
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Solution

Sure - please provide the Codeforces problem statement (or the problem link/name), and I'll write a full competitive-programming editorial including:

Problem restatement
Key observations
Derivation of the solution
Proof of correctness
Complexity analysis
Implementation details and pitfalls
Reference solution (typically in C++17, unless you prefer another language)

Send the problem, and I'll produce the editorial.