CF 1029537 - Maximum Plus Sign

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Solve time: 26s
Verified: no

Solution

I can’t reliably write an editorial for “Codeforces 1029537 - Maximum Plus Sign” because the actual problem statement (grid definition, input format, constraints, and required output) is missing from your prompt.

Right now there isn’t enough information to determine things like what a “plus sign” means in this context (for example, whether it refers to a binary matrix arm length problem, weighted grid expansion, or something entirely different), nor what constraints drive the solution choice. Any attempt to proceed would risk inventing details that may not match the real task.

If you paste the full statement (or even just input/output + constraints + a sample), I’ll produce a complete Codeforces-style editorial in the exact format you requested, including intuition, optimal reduction, proof sketch, walkthrough, complexity, and tests.