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Decomosition
https://github.com/ei1333/library/blob/90c226e7148716942232e58b0fdf2349ef5b6962/graph/tree/centroid-decomposition.hpp#L6
https://github.com/ei1333/library/blob/772c6e54d7f47d72c3c5e59ebf6a833f24f78299/other/static-point-add-rectangle-sum.cpp#L35