Hi, > 1 2 3 4 5 > 0 7 8 9 10 > 0 0 13 14 15 > 0 0 0 19 20 > 0 0 0 0 25 > Look at the triangle represented by the non-zero > integers. This triangle is a binary tree if we take 5 > as the root and walk down on both sides.
Are you sure? Is 9 a child of 4 or 10? A binary tree can have up to 2^n - 1 nodes. A matrix can have up to n^2 values, in your case of a half-empty matrix about (n-1)^2. -- http://mail.python.org/mailman/listinfo/python-list
