Soduku game 4x4 without using array [C++]

[facingproblem]

forum.codecall.net/attachment.php?attachmentid=1754&stc=1&d=124710122 2

Above is the image of the soduku requirement. I don't have any idea on how to do it without array. Anybody have solution for the problem above?

condition:-

1. array method restricted
2. each row or column need to fullfill the requirement of having 1234 numbers.
3. Each 2x2 subsection must hv all 1234 numbers
3. If each row or column filled in with the wrong numbers will appears an error msg.

Kindly help thnx

[WingedPanther]

Have a look at the discussion here: 4 by 4 sudoku without using arrays