Any mathematical hint to 'Building Towers'? or any good method to 'Labyrinth', i cannot store all the map, it's too big!

Well, actually you can store it in an array[1..1000,1..125] of byte, because you need only one bit for each cell. But I don't know the solution anyway...

Then it's very difficult to write the program

I don't think so :">

Could you give us any hints about this problem? Is this problem the same as finding the diameter of the tree? Do we need to store any Longint values in arrays?