Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:64:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:91:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp:98:13: warning: unused variable ‘x’ [-Wunused-variable] int x=F(node,up,m); ^