Compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:27:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[u].size(); ++i){ ^ user.cpp:29:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < q[v[u][i]].size(); ++j){ ^ user.cpp:30:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q[v[u][i]][j].father <= stiva.size()){ ^ user.cpp:39:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^