Compilare: user.cpp: In function ‘int main()’: user.cpp:37:71: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v.x*v.y*v.z>0 && v.x<=n && v.y<=n && v.z<=n && !viz[v.x][v.y][v.z]){ ^ user.cpp:37:76: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v.x*v.y*v.z>0 && v.x<=n && v.y<=n && v.z<=n && !viz[v.x][v.y][v.z]){ ^ user.cpp:37:81: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v.x*v.y*v.z>0 && v.x<=n && v.y<=n && v.z<=n && !viz[v.x][v.y][v.z]){ ^ user.cpp:26:24: warning: unused variable ‘j’ [-Wunused-variable] register int p,u,i,j,k,x,y,z,d; ^ user.cpp:26:26: warning: unused variable ‘k’ [-Wunused-variable] register int p,u,i,j,k,x,y,z,d; ^