Compilare: user.cpp: In function ‘int main()’: user.cpp:24:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i) ^ user.cpp: In function ‘void BFS()’: user.cpp:52:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[nod].size(); ++i) ^ user.cpp:64:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[nod].size(); ++i) ^