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- W2143632336 abstract "Given a permutation π of { 1 , … , n } and a positive integer k , can π be partitioned into at most k subsequences, each of which is either increasing or decreasing? We give an algorithm with running time 2 O ( k 2 log k ) n O ( 1 ) that solves this problem, thereby showing that it is fixed parameter tractable. This NP-complete problem is equivalent to deciding whether the cochromatic number of a given permutation graph on n vertices is at most k . Our algorithm solves in fact a more general problem: within the mentioned running time, it decides whether the cochromatic number of a given perfect graph on n vertices is at most k . To obtain our result we use a combination of two well-known techniques within parameterized algorithms: iterative compression and greedy localization. Consequently we name this combination “iterative localization”. We further demonstrate the power of this combination by giving an algorithm with running time 2 O ( k 2 log k ) n log n that decides whether a given set of n non-overlapping axis-parallel rectangles can be stabbed by at most k of a given set of horizontal and vertical lines." @default.
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- W2143632336 date "2013-10-01" @default.
- W2143632336 modified "2023-09-30" @default.
- W2143632336 title "Fixed-parameter algorithms for Cochromatic Number and Disjoint Rectangle Stabbing via iterative localization" @default.
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- W2143632336 doi "https://doi.org/10.1016/j.ic.2013.08.007" @default.
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