2009 | OriginalPaper | Chapter
Approximation and Hardness Results for Label Cut and Related Problems
Authors : Peng Zhang, Jin-Yi Cai, Linqing Tang, Wenbo Zhao
Published in: Theory and Applications of Models of Computation
Publisher: Springer Berlin Heidelberg
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We investigate a natural combinatorial optimization problem called the
Label Cut
problem. Given an input graph
G
with a source
s
and a sink
t
, the edges of
G
are classified into different categories, represented by a set of
labels
. The labels may also have weights. We want to pick a subset of labels of minimum cardinality (or minimum total weight), such that the removal of all edges with these labels disconnects
s
and
t
. We give the first non-trivial approximation and hardness results for the Label Cut problem. Firstly, we present an
$O(\sqrt{m})$
-approximation algorithm for the Label Cut problem, where
m
is the number of edges in the input graph. Secondly, we show that it is
NP
-hard to approximate Label Cut within
$2^{\log ^{1 - 1/\log\log^c n} n}$
for any constant
c
< 1/2, where
n
is the input length of the problem. Thirdly, our techniques can be applied to other previously considered optimization problems. In particular we show that the Minimum Label Path problem has the same approximation hardness as that of Label Cut, simultaneously improving and unifying two known hardness results for this problem which were previously the best (but incomparable due to different complexity assumptions).