Compilare: user.cpp: In function ‘int main()’: user.cpp:8:20: warning: unused variable ‘k’ [-Wunused-variable] int a,b,u,n,m,i,j,k,l,r,s,t,v,x,y,x1a,y1a,aq,q1,q1a,q2,q2a; ^ user.cpp:8:24: warning: unused variable ‘r’ [-Wunused-variable] int a,b,u,n,m,i,j,k,l,r,s,t,v,x,y,x1a,y1a,aq,q1,q1a,q2,q2a; ^ user.cpp:8:30: warning: unused variable ‘v’ [-Wunused-variable] int a,b,u,n,m,i,j,k,l,r,s,t,v,x,y,x1a,y1a,aq,q1,q1a,q2,q2a; ^