CF 105615N - Pentiment - Mark of Submission -

Rating: -
Tags: -
Solve time: 36s
Verified: no

Solution

The statement you provided is not actually sufficient to reconstruct a Codeforces problem.

What is visible is only the title, a stray “N”, and some formatting artifacts (“Lament Rain”, time/memory limits), but the core definition of the task is missing: there is no description of the input structure, no definition of the objects involved, and no statement of what must be computed or output.

Without that information, any attempt to write a correct editorial would necessarily be speculative. For Codeforces problems, the entire solution hinges on precise semantics, even small missing details like whether a graph is directed, whether updates are online, or what “N” represents completely changes the algorithmic structure.

To proceed, I need the full problem statement, including at least:

the input format, the output format, and the actual description of the process or constraints being modeled.

If you paste the complete text, I can produce the full editorial in the style you requested, including the derivation, proof, and implementation.