Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gf[node].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<bucket.size(); ++i){ ^ user.cpp:31:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore.in", "r", stdin); ^ user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore.out", "w", stdout); ^