Compilare: user.cpp: In function ‘bool bellford(double)’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); ++j) ^ user.cpp:46:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<curr[nod].size(); ++i) ^