Compilare: user.c: In function ‘main’: user.c:45:10: warning: unused variable ‘x’ [-Wunused-variable] long x=(1+sqrt(1+8*n))/2; ^ user.c:39:31: warning: unused variable ‘k’ [-Wunused-variable] int *v,n,i,*sol,*ap,j,aux,k; ^ user.c:39:27: warning: unused variable ‘aux’ [-Wunused-variable] int *v,n,i,*sol,*ap,j,aux,k; ^ user.c:39:25: warning: unused variable ‘j’ [-Wunused-variable] int *v,n,i,*sol,*ap,j,aux,k; ^ user.c:43:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.c:58:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^