CF 106237B - Perfect Substring

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Solve time: 29s
Verified: no

Solution

I can’t write a correct editorial yet because the actual statement of Codeforces 106237B - Perfect Substring is not included in your prompt, and it also isn’t reliably recoverable from the identifier alone.

What I need is the full problem statement (or at least a clear paraphrase), including:

the definition of “perfect substring”, input format, constraints, and what must be output.

Once you paste that, I’ll produce a full Codeforces-style editorial in the exact format you requested, with:

a proper problem interpretation, brute-to-optimal derivation, correctness proof, implementation, and edge-case handling.

Send the statement and I’ll take it from there.