Compilare: user.cpp: In function ‘void BFS()’: user.cpp:52:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size() ; ++ i){ ^ user.cpp: In function ‘int main()’: user.cpp:83:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1 ; i < H.size() ; ++ i) ^ user.cpp:94:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < H.size() ; ++ i) ^