Compilare: user.c: In function ‘QS’: user.c:28:37: warning: operation on ‘v[j]’ may be undefined [-Wsequence-point] v[i]=v[i]+v[j]-(v[j]=v[i]); ^ user.c:11:9: warning: unused variable ‘aux’ [-Wunused-variable] int aux; ^ user.c: In function ‘main’: user.c:53:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.c:56:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&v[i]); ^