Info : T is actually a triangulation -list of triangles-, in which each index corresponding to the row index of a vertex in another list -a vertices list-, it is a widely used technique used to store and write triangular meshes in mesh processing. Here below the example is a tetrahedron -4 facets-.
I actually realize this problem looks like a lot to my second problem, "Find a common edge" ( https://fr.mathworks.com/matlabcentral/cody/problems/45218-find-a-common-edge ) ...
Most nonzero elements in row
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 23 - Triangular matrix
Longest run of consecutive numbers
Center of mass
Find neighbor triangle indices
Query every vertices neighbor indices
Remove duplicated triangles
Query a vertex neighbors
Find a common edge
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