Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:17:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<V[index].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:24:8: warning: unused variable ‘f’ [-Wunused-variable] FILE *f = freopen("sortaret.in","r",stdin); ^ user.cpp:25:8: warning: unused variable ‘g’ [-Wunused-variable] FILE *g = freopen("sortaret.out","w",stdout); ^ user.cpp:29:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &N, &M); ^ user.cpp:32:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &x, &y); ^