Compilare: user.c: In function ‘main’: user.c:17:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi.in", "r", stdin); ^ user.c:18:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi.out", "w", stdout); ^ user.c:21:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:23:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ user.c:26:9: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] int p, q; ^ user.c:7:14: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] int S = v[x]; ^ user.c:26:6: note: ‘p’ was declared here int p, q; ^