Compilare: user.cpp: In function ‘int LCA(int, int)’: user.cpp:50:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void F(int)’: user.cpp:65:32: 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)’: user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^