Problem link : (http://mirror.codeforces.com/problemset/problem/166/E)
How to solve this problem log(n) with binary exponentiation of some 2 × 2 matrix into power n. Needs some explanation in this problem .Thanks in advance.
Sorry for bad english.
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Not sure how to do it with a 2x2 matrix, but I solved this problem by exponentiating a 4x4 adjacency matrix. I'm guessing the 2x2 solution somehow exploits the symmetry in the tetrahedron.