Data structures achieve O(log* n) per operation for tree-sum queries on decremental forests using micro-macro decomposition, plus a universally optimal algorithm in the group model.
Secher, and Maz Spork
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Fast decremental tree sums in forests
Data structures achieve O(log* n) per operation for tree-sum queries on decremental forests using micro-macro decomposition, plus a universally optimal algorithm in the group model.