Compilare: user.cpp: In function ‘int main()’: user.cpp:53:10: warning: unused variable ‘q’ [-Wunused-variable] long q,x1,y1,z1,j,s=0,i; ^ user.cpp:53:21: warning: unused variable ‘j’ [-Wunused-variable] long q,x1,y1,z1,j,s=0,i; ^ user.cpp: In function ‘void quicksort(long int*, long int, long int)’: user.cpp:31:8: warning: ‘piv’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(a[i]<piv) ^ user.cpp:28:22: warning: ‘ma’ may be used uninitialized in this function [-Wmaybe-uninitialized] piv=x+y+z-mi-ma; ^