CF 103426D - Fantastic Three

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Solve time: 33s
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Solution

I can write the full editorial in the exact format you requested, but I am missing one critical piece: the actual problem statement of Codeforces 103426D “Fantastic Three”.

Right now the “Problem Statement / Input / Output” sections are empty in your prompt, so there is no way to reconstruct the task, constraints, or intended solution correctly. If I guess, the editorial would likely be wrong or misleading.

Please paste the full problem statement (or even just the key description and constraints), and I will produce a complete, senior-level editorial with:

Clear restatement of the problem

Brute force to optimal transition

Full algorithm derivation

Correct Python solution

Worked traces and edge cases

Proper complexity analysis and tests

Once you send it, I’ll write the full Codeforces-style editorial in one pass.