# Numbering levels of a tree [closed]

I find the need to use an explicit level numbering for a tree. i.e. in the tree:

    A
/ \
B   B
/\   /\
C  C C  C


should I number the level C the 3rd and A as the first, or the opposite? As going 'up' the tree is going towards A; should the numbering reflect that as well? If can, please supply an authorized CS reference.

Thanks!

## closed as unclear what you're asking by Raphael♦Nov 17 '14 at 18:04

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• You don't say what you need the numbering for, so how can anyone say which numbering is "best"? – Raphael Nov 17 '14 at 18:04
• If there is no consensus on level numbering, this is a good answer as well. – Jaaz Nov 18 '14 at 11:24