Project not showing/crashing when adding a simple line of code

[FBF_Luis]

I ran my code in VSC and after some seconds it return the bad_alloc error, which means it was indeed an absurd amount of objects. Each entry of my matrix is an object I called "Cell" and my goal was for each cell to have 8 other cells as neighbours. Since NCOL is 40, I thought I would have 40*8 obejcts in the neighbours lists. Seeing your explanation, I realize I had the math all wrong and although I don't think it is as bad as you mentioned, it is still an exponential amount of objects which is not good.

Anyways, I followed your suggestion of making a list of pairs and the app is now running fine, so thank you

[d_stranz]

Since NCOL is 40, I thought I would have 40*8 objects

Actually 40 * 40 * 8 if your math had been correct. But I am not sure if I can calculate the true number.

So let's see:

For the first row:

mat[0][0] contains 8 copies of mat, none of which have copies of mat.
mat[0][1] contains 8 more copies, one of which (mat[0][0]) also has 8 copies
mat[0][2] - mat[0][38] also each contain 8 copies, one of which (mat[0][n-1]) has 8 more
mat[0][39] has 8 copies plus 16 more (mat[0][0] and mat[0][38]) (I think your grid wraps)

For the second row:

mat[1][0] has 8 copies, plus mat[0][0] and mat[0][1] for 16 more. But mat[0][1] also has mat[0][0] for 8 more.
mat[1][2] has 8, plus mat[0][0], mat[0][1] and mat[0][2] for 24 more. The last two have [0][n-1] for another 16
same for 3 - 38.
mat[1][39] has 8 plus 24 plus 16 plus the 32 from mat[1][0] because of wrapping

and it just gets worse. By the time you get to [39][39] the total is somewhere near a gazillion. :-)

Glad the simpler solution worked for you.