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++) ^ user.cpp: In function ‘int main()’: user.cpp:224:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disconnect.out","w",stdout); ^