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• W1609596108 abstract "We present algorithms that run in linear time on pointer machines for a collection of problems, each of which either directly or indirectly requires the evaluat ion of a function defined on paths in a tree. These problems previously had linear-time algorithms but only for random-access machines (RAMs); the best pointer-machine algorithms were super-linear by an inverse-Ackermann-function factor. Our algorithms are also simpler, in some cases substantially, t han the previous linear-time RAM algorithms. Our improvements come primarily from three new ideas: a refin ed analysis of path compression that gives a linear bound if the compressions favor certain nodes, a pointer-based radix sort as a replacement for table-based methods, and a more careful partitioning of a tree into easily managed parts. Our algorithms compute nearest common ancestors off-line, verify and construct minimum spanning trees, do interval analysis on a flowgraph, find the dominators of a flowg raph, and build the component tree of a weighted tree." @default.
• W1609596108 created "2016-06-24" @default.
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• W1609596108 date "2002-07-15" @default.
• W1609596108 modified "2023-09-27" @default.
• W1609596108 title "Linear-Time Pointer-Machine Algorithms for Path-Evaluation Problems on Trees and Graphs" @default.
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