Compilare: user.c: In function ‘pop’: user.c:62:9: warning: unused variable ‘i’ [-Wunused-variable] int i, au = a[0]; ^ user.c: In function ‘main’: user.c:75:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x; ^ user.c:72:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in", "r", stdin); ^ user.c:73:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out", "w", stdout); ^ user.c:76:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &m); ^ user.c:80:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^