Recently I learned FFT so I need problems of FFT of different competitive sites. Can you guys provide good problem in comment section:)
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Codeforces (c) Copyright 2010-2024 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 19.11.2024 21:19:34 (l3).
Десктопная версия, переключиться на мобильную.
При поддержке
https://www.codechef.com/problems/SUMXOR2 (Relatively Easy)
https://www.codechef.com/problems/CHEFSSM (Requires math other than FFT too)
How to solve the second one? My reduction:
I reduced to calculating values of the polynom $$$(a_1 - x)(a_2 - x)...(a_n - x)$$$ in points $$$0, 2, 4, ...$$$
. I heard something about this(evaluation?) where can I read about this?
You can read more here — https://discuss.codechef.com/t/chefssm-editorial/80479
It contains relevant tutorial(s) link(s) as well !
https://mirror.codeforces.com/contest/632/problem/E
Problem C from SWERC 2014/15 https://mirror.codeforces.com/gym/100783.
Check this blog
https://mirror.codeforces.com/contest/1251/problem/F (FFT)
https://mirror.codeforces.com/contest/438/problem/E (FFT + generating function)
1398G - Running Competition
1218E - Product Tuples
101821F - Lazy Hash Table
https://open.kattis.com/problems/binaryvoting
I guess you know you can filter CF problemset by tag but if you didn't know https://mirror.codeforces.com/problemset?tags=fft
Here are some FFT problems in Codeforces. Hope it'll help :)
528D - Fuzzy Search(Maybe it's better to use NTT?)
623E - Transforming Sequence
993E - Nikita and Order Statistics