Compilare: main.cpp: In function 'void FFT(std::vector<cd>&)': main.cpp:45:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<cd>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | while(n < A.size()) n <<= 1, ++p; | ~~^~~~~~~~~~ main.cpp: In function 'vi mult(const vi&, const vi&)': main.cpp:68:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | while(n < A.size() + B.size() - 1) n <<= 1; | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:77:16: warning: moving a local object in a return statement prevents copy elision [-Wpessimizing-move] 77 | return move(R); | ~~~~^~~ main.cpp:77:16: note: remove 'std::move' call main.cpp: In function 'int main()': main.cpp:91:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 91 | if(Frecv.size() <= v) Frecv.resize(v+1); | ~~~~~~~~~~~~~^~~~ main.cpp:105:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | if(v >= Rez.size()) printf("0\n"); | ~~^~~~~~~~~~~~~