Compilare: main.cpp: In function 'void multiply(std::vector<Complex>&, std::vector<Complex>)': main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((1 << p) < a.size() || (1 << p) < b.size()) ~~~~~~~~~^~~~~~~~~~ main.cpp:71:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((1 << p) < a.size() || (1 << p) < b.size()) ~~~~~~~~~^~~~~~~~~~ main.cpp:77:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < a.size() ; i++) ~~^~~~~~~~~~ main.cpp:80:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < a.size() ; i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < line1.size() ; i++) ~~^~~~~~~~~~~~~~ main.cpp:112:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < line2.size() ; i++) ~~^~~~~~~~~~~~~~ main.cpp:117:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < line1.size() ; i++){ ~~^~~~~~~~~~~~~~ main.cpp:123:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < line2.size() ; i++) ~~^~~~~~~~~~~~~~ main.cpp:129:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = line1.size() - 1; i < line2.size() ; i++){ ~~^~~~~~~~~~~~~~