Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘void Solve()’: user.cpp:101:9: warning: unused variable ‘i’ [-Wunused-variable] int i=1,j=1; ^ user.cpp:101:13: warning: unused variable ‘j’ [-Wunused-variable] int i=1,j=1; ^