Compilare: user.cpp: In function ‘int main()’: user.cpp:34:6: warning: statement has no effect [-Wunused-value] for(n; n>=1; n>>=1){ ^ user.cpp:18:11: warning: unused variable ‘i’ [-Wunused-variable] long long i,j,a[4][4],p[4][4],n,m,t1,t2,t3,t4; ^ user.cpp:18:13: warning: unused variable ‘j’ [-Wunused-variable] long long i,j,a[4][4],p[4][4],n,m,t1,t2,t3,t4; ^ user.cpp:18:33: warning: unused variable ‘m’ [-Wunused-variable] long long i,j,a[4][4],p[4][4],n,m,t1,t2,t3,t4; ^