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1018 Ladies' Shop constructive algorithms fft math Statement E Codeforces Round 176 (Div. 1) {286} PROGRAMMING Tutorial 2600
316 Xor on Figures constructive algorithms fft math Statement I Good Bye 2019 {1270} PROGRAMMING Разбор Goodbye 2019 3400
294 Harry The Potter brute force constructive algorithms dp fft implementation math Statement F Codeforces Round 612 (Div. 1) {1286} PROGRAMMING Codeforces Round #612 - Editorial 3200
133 Mio and Lucky Array constructive algorithms fft math strings Statement G CodeTON Round 2 (Div. 1 + Div. 2, Rated, Prizes!) {1704} PROGRAMMING 3500.0 CodeTON Round 2 Editorial