Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple-Source Multiple-Sink Maximum Flow in Directed Planar Graphs in
  $O(n^{1.5} \log n)$ Time   We give an $O(n^{1.5} \log n)$ algorithm that, given a directed planar graph
with arc capacities, a set of source nodes and a set of sink nodes, finds a
maximum flow from the sources to the sinks.

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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex