Compilare: user.cpp: In function ‘std::vector<int> prefix_function(std::string)’: user.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(F[i]==p.size()) ^ user.cpp: In function ‘int main()’: user.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<b.size(); i++) ^ user.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[i]==p.size()) ^