Compilare: user.cpp: In function ‘int main()’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<B[i].size();++j) ^ user.cpp:54:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<F[nod].size();++i) ^ user.cpp:61:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<B[nou].size();++j) ^ user.cpp:74:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<B[nod].size();++i) ^ user.cpp:81:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<F[nou].size();++j) ^