Compilare: user.cpp: In function ‘int main()’: user.cpp:27:11: warning: statement has no effect [-Wunused-value] for (q; q > 0; --q) { ^ user.cpp:25:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &q); ^ user.cpp:28:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%d", &n, &k); ^