human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "structural parameterizations of the mixed chinese postman problem"
  Abstract: In the Mixed Chinese Postman Problem (MCPP), given a weighted mixed graph $G$ ($G$ may have both edges and arcs), our aim is to find a minimum weight closed walk traversing each edge and arc at least once. The MCPP parameterized by the number of edges in $G$ or the number of arcs in $G$ is fixed-parameter tractable as proved by van Bevern {\em et al.} (in press) and Gutin, Jones and Sheng (ESA 2014), respectively. In this paper, we consider the unweighted version of MCPP. Solving an open question of van Bevern {\em et al.} (in press), we show that somewhat unexpectedly MCPP parameterized by the (undirected) treewidth of $G$ is W[1]-hard. In fact, we prove that even the MCPP parameterized by the pathwidth of $G$ is W[1]-hard. On the positive side, we show that the unweighted version of MCPP parameterized by tree-depth is fixed-parameter tractable. We are unaware of any natural graph parameters between pathwidth and tree-depth and so our results provide a dichotomy of the complexity of MCPP. Furthermore, we believe that MCPP is the first problem known to be W[1]-hard with respect to treewidth but FPT with respect to tree-depth.

Connected through hyperedge HE-1 (induced by source paper "sat encodings for treecut width and treedepth"):
  with members:
    - "a parameterized strongly polynomial algorithm for block structured integer programs"
    - "the complexity landscape of decompositional parameters for ilp"
    - "on the power of tree depth for fully polynomial fpt algorithms"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "kernelizing mso properties of trees of fixed height and some consequences"
    - "a faster parameterized algorithm for treedepth"
    - "computing tree depth faster than 2 n"
    - "where first order and monadic second order logic coincide"

Connected through hyperedge HE-2 (induced by source paper "the complexity landscape of decompositional parameters for ilp"):
  with members:
    - "a structural approach to kernels for ilps treewidth and total unimodularity"
    - "backdoors to satisfaction"
    - "better algorithms for satisfiability problems for formulas of bounded rank width"

Connected through hyperedge HE-3 (induced by source paper "the euler and chinese postman problems on 2 arc colored digraphs"):
  with members:
    - "chinese postman problem on edge colored multigraphs"
    - "parameterized directed k chinese postman problem and k arc disjoint cycles problem on euler digraphs"
    - "parameterized complexity of the k arc chinese postman problem"
    - "parameterized complexity of k chinese postman problem"
    - "on channel discontinuity constraint routing in wireless networks"

Connected through hyperedge HE-4 (induced by source paper "the parameterized complexity of the minimum shared edges problem"):
  with members:
    - "the minimum shared edges problem on grid like graphs"
    - "the minimum shared edges problem on planar graphs"
    - "on the parameterized complexity of computing balanced partitions in graphs"
    - "parameterized complexity of the k arc chinese postman problem"
    - "list h coloring a graph by removing few vertices"
    - "kernelization lower bounds by cross composition"
    - "finding small separators in linear time via treewidth reduction"
    - "solving connectivity problems parameterized by treewidth in single exponential time"

Connected through hyperedge HE-5 (induced by source paper "a fixed parameter algorithm for a routing open shop problem unit processing times few machines and locations"):
  with members:
    - "a parameterized complexity view on non preemptively scheduling interval constrained jobs few machines small looseness and small slack"
    - "completing partial schedules for open shop with unit processing times and routing"
    - "interval scheduling and colorful independent sets"
    - "approximation algorithms for mixed windy and capacitated arc routing problems"
    - "parameterized complexity of the k arc chinese postman problem"
    - "parameterized complexity of k chinese postman problem"
    - "parameterized rural postman problem"

Connected through hyperedge HE-6 (induced by source paper "completing partial schedules for open shop with unit processing times and routing"):
  with members:
    - "a parameterized complexity view on non preemptively scheduling interval constrained jobs few machines small looseness and small slack"
    - "interval scheduling and colorful independent sets"
    - "approximation algorithms for mixed windy and capacitated arc routing problems"
    - "parameterized complexity of the k arc chinese postman problem"
    - "parameterized complexity of k chinese postman problem"

Connected through hyperedge HE-7 (induced by source paper "chinese postman problem on edge colored multigraphs"):
  with members:
    - "parameterized complexity of the k arc chinese postman problem"
    - "on channel discontinuity constraint routing in wireless networks"
    - "note on counting eulerian circuits"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CC(Computational Complexity)