Compilare: user.c: In function ‘main’: user.c:47:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.in", "rt", stdin); ^ user.c:48:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.out", "wt", stdout); ^ user.c:50:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^