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Author

Elena Grigorescu

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Jul 2026

Testing the Independent Set Property in Hypergraphs

This work proves a new upper bound of $\widetilde{O}\!\left(\frac{q\rho^{2q-3}}{\varepsilon^2 (q-2)!^2}\right)$ on the sample complexity of testing the $\rho$-independent set property.

Elena Grigorescu, Shreya Nasa, Cameron Seth · 1 citation
Preprint Aug 2026

Space-Efficient Hierholzer for Undirected Graphs

We present a simple linear-time algorithm that outputs an Eulerian tour of an undirected multigraph with $n$ vertices and $m$ edges, if one exists, in $O(m)$ time and using $O(n)$ words of working memory. The input is given as read-only adjacency lists, and the output is written to an append-only stream in traversal or...

Elena Grigorescu, Ziad Ismaili Alaoui, Tamio-Vesa Nakajima et al. · 0 citations
Preprint Aug 2026

A Linear-Time Approximation Scheme for the Densest Subgraph Problem

This paper provides the first truly linear-time approximation scheme for the Densest Subgraph Problem, and uses assignments arising from a flow-based formulation together with a structural carving lemma to progressively carve "sparse" parts of the graph while nearly preserving the densest subgraph.

Elena Grigorescu, Mehrshad Taziki · 0 citations

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