CF 104017J - Boundary

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Tags: -
Solve time: 27s
Verified: no

Solution

I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 104017J - Boundary is missing from your prompt.

Right now I only see empty sections for the statement, input, and output, which means there’s no information about:

what the grid/array/graph/object is,
what “Boundary” refers to in this context,
what transformations or queries are involved,
or what constraints shape the solution.

Given Codeforces problems are highly structure-dependent, any attempt to “fill in” the missing statement would risk inventing a different problem entirely, which would defeat the purpose of an accurate editorial.

If you paste the full problem statement (or even just a screenshot or raw text), I’ll produce the complete editorial in the exact style you requested, including:

a clean re-derivation of the solution, optimal algorithm reasoning, walkthrough, proof sketch, Python implementation, and edge-case analysis.