Compilare: user.cpp: In function ‘int main()’: user.cpp:37:82: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(k.x>=1 && k.x<=N && k.y>=1 && k.y<=N && k.z>=1 && k.z<=N && !a[k.x][k.y][k.z]){ ^ user.cpp:37:87: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(k.x>=1 && k.x<=N && k.y>=1 && k.y<=N && k.z>=1 && k.z<=N && !a[k.x][k.y][k.z]){ ^ user.cpp:37:92: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(k.x>=1 && k.x<=N && k.y>=1 && k.y<=N && k.z>=1 && k.z<=N && !a[k.x][k.y][k.z]){ ^ user.cpp:38:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[k.x][k.y][k.z]=1; ^ user.cpp:38:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[k.x][k.y][k.z]=1; ^ user.cpp:38:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[k.x][k.y][k.z]=1; ^ user.cpp:39:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[k.x][k.y][k.z]=i; ^ user.cpp:39:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[k.x][k.y][k.z]=i; ^ user.cpp:39:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[k.x][k.y][k.z]=i; ^