Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.in", "r", stdin); ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.out", "w", stdout); ^