Compilare: user.cpp: In function ‘void Read()’: user.cpp:48:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[x].size(); ++i) ^ user.cpp: In function ‘void BFS()’: user.cpp:58:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[nod].size(); ++i) ^ user.cpp:65:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < V[V[nod][i]].size(); ++j) ^