Take a look at the tags on this problem:
FFT? DP? bitmask? is this an inside joke that im not getting? why does it seem like for every problem most of the tags are completely fake?
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Before contest
Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
42:13:51
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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
42:13:51
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
42:13:51
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
42:13:51
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*has extra registration
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At least, now I can say that I solved a FFT problem.