Compilare: user.cpp: In function ‘int main()’: user.cpp:18:48: warning: unused variable ‘k’ [-Wunused-variable] int i,j,n,t1,t2,s1,s2,s3,s4,r1,r2,r3,r4,nr,k,in,jn; ^ user.cpp:18:50: warning: unused variable ‘in’ [-Wunused-variable] int i,j,n,t1,t2,s1,s2,s3,s4,r1,r2,r3,r4,nr,k,in,jn; ^ user.cpp:18:53: warning: unused variable ‘jn’ [-Wunused-variable] int i,j,n,t1,t2,s1,s2,s3,s4,r1,r2,r3,r4,nr,k,in,jn; ^