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: "unary subset sum is in logspace"
  Abstract: In this paper we consider the Unary Subset-Sum problem which is defined as follows: Given integers m1, . . . ,mn and B (written in unary), we define the subset sum problem to be that of determining whether or not there exists an S ⊆ [n] so that ∑ i∈Smi = B (note that for this problem the mi are often assumed to be non-negative). Let C = |B| + ∑n i=1 |xi| + 1. This problem can be solved using a standard dynamic program using space O(C) and time O(Cn). The dynamic program makes fundamental use of this large space and it is interesting to ask whether this requirement can be removed. Unary SubsetSum has been studied in small-space models of computation as early as 1980 in [4], where they showed that it was in NL. Since then the problem was studied in [2], where Cho and Huynh devised a complexity class between L and NL that contained Unary Subset-Sum as supporting evidence that it is not NL-complete. This problem was listed again in [1] claiming it to be an open problem as to whether or not it is in L. It was recently shown in [3] that this problem was in Logspace. Unfortunately, their algorithm is somewhat complicated. We provide a simple algorithm solving this problem in Logspace.

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)