CF 105874I - Another task on parentheses sequences

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Solve time: 21s
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Solution

I can write the full editorial in exactly the style you want, but I’m missing the actual problem content.

“Codeforces 105874I - Another task on parentheses sequences” doesn’t include the statement in your message, and I don’t have access to external problem archives from here. Without knowing what is being asked (counting valid sequences, DP constraints, transformations, queries, etc.), I’d risk inventing the wrong task, which would make the editorial useless.

Paste the full statement (or even just the key parts: input format, output format, constraints, and what needs to be computed), and I’ll produce a complete Codeforces-style editorial with:

a clean rephrased problem understanding,

derivation from brute force to optimal solution,

full correctness reasoning,

Python implementation,

worked traces,

and edge-case analysis.