
We analyze a common feature of p-Kemeny AGGregation (p-KAGG) and p-One-Sided Crossing Minimization (p-OSCM) to provide new insights and findings of interest to both the graph drawing community and the social choice community. We obtain parameterized subexponential-time algorithms for p-KAGG—a problem in social choice theory—and forp-OSCM—a problem in graph drawing. These algorithms run in time O.2 O. p k logk/ /, where k is the parameter, and significantly improve the previous best algorithms with running times O.1.403 k / and O.1.4656 k /, respectively. We also study natural "above-guarantee" versions of these problems and show them to be fixed parameter tractable. In fact, we show that the above-guarantee versions of these problems are equivalent to a weighted variant of p-directed feedback arc set. Our results for the above-guarantee version of p-KAGG reveal an interesting contrast. We show that when the number of "votes" in the input top-KAGG is odd the above guarantee version can still be solved in time O.2 O. p k logk/ /, while if it is even then the problem cannot have a subexponential time algorithm unless the exponential time hypothesis fails (equivalently, unless FPTD Ma1c).
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