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My program at https://atcoder.jp/contests/abc214/submissions/30708618 got "Segmentation fault".
gdb shows following: Program received signal SIGSEGV, Segmentation fault. atcoder::internal::butterfly<atcoder::static_modint<1000000007, (void*)0>, (void*)0> (a=std::vector of length 2048, capacity 2048 = {...}) at ../../../include/atcoder/convolution.hpp:107 107 rot *= info.rate3[bsf(~(unsigned int)(s))];
My program worked after I changed line 65, as https://atcoder.jp/contests/abc214/submissions/30709044
Am I using in a wrong way?