Compilare: user.cpp: In function ‘bool bfs(int, int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[nod].size();++i) ^ user.cpp: In function ‘void solve()’: user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[d].size();++i) ^ user.cpp: In function ‘void search(int, bool*)’: user.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:92:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<M.size();++i) ^ user.cpp:95:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<M.size();++i) ^