Neighboring triangles of each vertex

[ria91]

I have a mesh with unstructured triangular grid.
I need to find neighboring triangles of each vertex. How can I do it?
Thanks before :D

 

[chiro]

Hey ria91.

What exactly is the data structure like? If its just a list of triangles then do a double loop (runtime O(n^2)) where you fix one triangle and get all the other triangles that have at least one similar vertex.