CF 105947I - Di chuyển trên lưới
I cannot reliably produce a correct editorial yet because the full official statement of Codeforces Gym 105947I - Di chuyển trên lưới is not included in your prompt, and reconstructing it purely from memory would risk inventing details.
CF 105947I - Di chuy\u1ec3n tr\u00ean l\u01b0\u1edbi
Rating: -
Tags: -
Solve time: 22s
Verified: no
Solution
I cannot reliably produce a correct editorial yet because the full official statement of Codeforces Gym 105947I - Di chuyển trên lưới is not included in your prompt, and reconstructing it purely from memory would risk inventing details.
From the available trace, the problem is a grid graph with column heights and a definition of a cost function between endpoints of columns, but the exact definition of movement endpoints, what is being summed, and the constraints matter critically for the solution technique. A small mismatch (for example whether movement is between top cells, bottom cells, or arbitrary cells) completely changes the algorithm.
If you paste the full statement, I can immediately produce the full editorial in the exact style you requested, including a complete derivation, proof sketch, and implementation.
To make this efficient, you can just send:
the full statement text or even a screenshot copy.
Once I have it, I will write the full Codeforces-style editorial with:
clear reduction,
optimal data structure or DP idea,
formal reasoning,
and a clean Python implementation.