ICS Theory Group

ICS 269, Spring 2002: Theory Seminar


3 May 2002:
Oracles for Distances Avoiding a Link-failure, by Camil Demetrescu and Mikkel Thorup, SODA 2002.
Speaker: Jonathan Sun

Abstract: Two queries are considered in a directed graph G: distance(x,y,u,v) that returns the shortest distance from x to y in G that does not contain edge (u,v); path(x,y,u,v) that returns the shortest path, if any, from x to y in G that does not contain edge (u,v). The authors show two oracles, one with query time O(logn) and space O(n^2 logn) and the other with query time O(1) and space O(n^2.5).