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- Susanne Albers, Stefan Eilts, Eyal Even-Dar, Yishay Mansour, Liam Roditty
- ACM Trans. Economics and Comput.
- 2006

We study a network creation game recently proposed by Fabrikant, Luthra, Maneva, Papadimitriou and Shenker. In this game, each player (vertex) can create links (edges) to other players at a cost of α per edge. The goal of every player is to minimize the sum consisting of (a) the cost of the links he has created and (b) the sum of the distances to all… (More)

- Liam Roditty, Uri Zwick
- Algorithmica
- 2004

We obtain the following results related to dynamic versions of the shortest-paths problem: (i) Reductions that show that the incremental and decremental single-source shortest-paths problems, for weighted directed or undirected graphs, are, in a strong sense, at least as hard as the static all-pairs shortest-paths problem. We also obtain slightly weaker… (More)

- Liam Roditty, Uri Zwick
- 45th Annual IEEE Symposium on Foundations of…
- 2004

We obtain three dynamic algorithms for the approximate all-pairs shortest paths problem in unweighted undirected graphs: 1) For any fixed /spl epsiv/ > 0, a decremental algorithm with an expected total running time of O(mn), where m is the number of edges and n is the number of vertices in the initial graph. Each distance query is answered in O(1)… (More)

- Mihai Patrascu, Liam Roditty
- 2010 IEEE 51st Annual Symposium on Foundations of…
- 2010

We give the first improvement to the space/approximation trade-off of distance oracles since the seminal result of Thorup and Zwick [STOC'01]. For unweighted graphs, our distance oracle has size $O(n^{5/3}) = O(n^{1.66\cdots})$ and, when queried about vertices at distance $d$, returns a path of length $2d+1$. For weighted graphs with $m=n^2/\alpha$ edges,… (More)

- Liam Roditty, Uri Zwick
- ACM Trans. Algorithms
- 2005

Let <i>G</i> = (<i>V,E</i>) be a <i>directed</i> graph and let <i>P</i> be a shortest path from <i>s</i> to <i>t</i> in <i>G</i>. In the <i>replacement paths</i> problem, we are required to find, for every edge <i>e</i> on <i>P</i>, a shortest path from <i>s</i> to <i>t</i> in <i>G</i> that avoids <i>e</i>. The only known algorithm for solving the problem,… (More)

- Liam Roditty, Mikkel Thorup, Uri Zwick
- ICALP
- 2005

- Liam Roditty, Uri Zwick
- FOCS
- 2002

We obtain several new dynamic algorithms for maintaining the transitive closure of a directed graph, and several other algorithms for answering reachability queries without explicitly maintaining a transitive closure matrix. Among our algorithms are: (i) A decremental algorithm for maintaining the transitive closure of a directed graph, through an arbitrary… (More)

- Liam Roditty, Uri Zwick
- SIAM J. Comput.
- 2004

We obtain a new fully dynamic algorithm for the reachability problem in directed graphs. Our algorithm has an amortized update time of <i>O</i>(<i>m</i>+<i>n</i> log <i>n</i>) and a worst-case query time of <i>O</i>(<i>n</i>), where <i>m</i> is the current number of edges in the graph, and <i>n</i> is the number of vertices in the graph. Each update… (More)

- Lee-Ad Gottlieb, Liam Roditty
- ESA
- 2008

For a set S of points in a metric space, a t-spanner is a graph on the points of S such that between any pair of points there is a path in the spanner whose total length is at most t times the actual distance between the points. In this paper, we consider points residing in a metric space of doubling dimension λ, and show how to construct a dynamic (1+… (More)

- Aaron Bernstein, Liam Roditty
- SODA
- 2011

We present the first dynamic shortest paths algorithms that make any progress beyond a long-standing <i>O</i>(<i>n</i>) update time barrier (while maintaining a reasonable query time), although it is only progress for not-too-sparse graphs. In particular, we obtain new decremental algorithms for two approximate shortest-path problems in unweighted,… (More)