Compilare: user.c: In function ‘main’: user.c:16:38: warning: variable ‘q2’ set but not used [-Wunused-but-set-variable] int i, j, n, sp3, x, p1, p2, q1, q2; ^ user.c:16:34: warning: variable ‘q1’ set but not used [-Wunused-but-set-variable] int i, j, n, sp3, x, p1, p2, q1, q2; ^ user.c:16:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, n, sp3, x, p1, p2, q1, q2; ^ user.c:16:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j, n, sp3, x, p1, p2, q1, q2; ^ user.c:28:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.in", "r", stdin); ^ user.c:30:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:34:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.in", "r", stdin); ^ user.c:35:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.out", "w", stdout); ^ user.c:37:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:41:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.c:51:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^