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STOC
1993
ACM
109views Algorithms» more  STOC 1993»
15 years 2 months ago
Routing permutations on graphs via matchings
We consider a class of routing problems on connected graphs G. Initially, each vertex v of G is occupied by a “pebble” which has a unique destination π(v) in G (so that π is...
Noga Alon, Fan R. K. Chung, Ronald L. Graham
COMBINATORICS
1999
85views more  COMBINATORICS 1999»
14 years 9 months ago
Permutation Patterns and Continued Fractions
We find, in the form of a continued fraction, the generating function for the number of (132)-avoiding permutations that have a given number of (123) patterns, and show how to ext...
Aaron Robertson, Herbert S. Wilf, Doron Zeilberger
ISAAC
2009
Springer
245views Algorithms» more  ISAAC 2009»
15 years 4 months ago
Pattern Matching for 321-Avoiding Permutations
Sylvain Guillemot, Stéphane Vialette
SIGECOM
2009
ACM
92views ECommerce» more  SIGECOM 2009»
15 years 4 months ago
The adwords problem: online keyword matching with budgeted bidders under random permutations
We consider the problem of a search engine trying to assign a sequence of search keywords to a set of competing bidders, each with a daily spending limit. The goal is to maximize ...
Nikhil R. Devenur, Thomas P. Hayes
EUROCRYPT
2000
Springer
15 years 1 months ago
The Sum of PRPs Is a Secure PRF
Given d independent pseudorandom permutations (PRPs) i, . . . , d over {0, 1}n , it appears natural to define a pseudorandom function (PRF) by adding (or XORing) the permutation re...
Stefan Lucks