Compilare: user.c: In function ‘perm’: user.c:25:21: warning: unused variable ‘cycle’ [-Wunused-variable] int i,start,finish,cycle = 1,k; ^ user.c: In function ‘main’: user.c:50:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm2.in","rt",stdin); ^ user.c:51:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm2.out","wt",stdout); ^ user.c:52:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.c:54:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p[i]); ^