Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:34: 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:48:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in", "r", stdin); ^ user.cpp:49:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out", "w", stdout); ^