Compilare: user.cpp: In function ‘void Erase(int)’: user.cpp:21:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it = 0 ; it < H[y].size(); ++ it) ^ user.cpp: In function ‘int Search(int)’: user.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it = 0; it < H[y].size(); ++ it) ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:39:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it = 0 ; it < G[nod].size() ; ++ it) ^