Compilare: main.cpp: In function 'int main()': main.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0; p<prim.size() && V!=1; ++p) ~^~~~~~~~~~~~ main.cpp:88:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0; p<f[i].size(); ++p) ~^~~~~~~~~~~~