Compilare: user.cpp: In function ‘int main()’: user.cpp:24:11: warning: statement has no effect [-Wunused-value] x[1000]; ^ user.cpp:25:11: warning: statement has no effect [-Wunused-value] y[1000]; ^ user.cpp:22:35: warning: unused variable ‘p1’ [-Wunused-variable] int n,x[1000],y[1000],i,nrt=0,p1 , p2 , k , j ; ^ user.cpp:22:40: warning: unused variable ‘p2’ [-Wunused-variable] int n,x[1000],y[1000],i,nrt=0,p1 , p2 , k , j ; ^ user.cpp:45:36: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] sort(a+1,a+k+1,sortare); if(x[j]-x[i]!=0) ^