Compilare: user.c: In function ‘main’: user.c:32:7: warning: unused variable ‘k’ [-Wunused-variable] int k; ^ user.c: In function ‘perm’: user.c:27:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:33:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^