Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<V[q].size(); i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("orient.in","r",stdin); ^ main.cpp:28:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("orient.out","w",stdout); ^