CF 103261D - FFT Algorithm
I can’t write a correct editorial for “Codeforces 103261D - FFT Algorithm” because the actual problem statement (what is being computed, what the input represents, and what constraints apply) is missing.
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Solution
I can’t write a correct editorial for “Codeforces 103261D - FFT Algorithm” because the actual problem statement (what is being computed, what the input represents, and what constraints apply) is missing.
Right now I only have the title, so anything detailed about FFT usage, transformations, or intended solution would be guesswork, and that would risk producing a completely incorrect editorial.
If you paste the full problem statement, I’ll produce the complete Codeforces-style editorial in the exact format you specified, including:
a proper rephrasing of the problem, a derivation of why FFT applies (if it actually does), a step-by-step algorithm walkthrough, full Python solution, and edge-case reasoning.
Send the statement and I’ll continue from there.