The maximum clique interdiction problem

Fabio Furini (1) , Ivana Ljubić (2) , Sébastien Martin (3) , Pablo San Segundo (4)

1 LAMSADE - Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision
2 ESSEC Business School
3 LCOMS - Laboratoire de Conception, Optimisation et Modélisation des Systèmes
4 UPM - Universidad Politécnica de Madrid

Given a graph G and an interdiction budget k, the Maximum Clique Interdiction Problem asks to find a subset of at most k vertices to remove from G so that the size of the maximum clique in the remaining graph is minimized. This problem has applications in many areas, such as crime detection, prevention of outbreaks of infectious diseases and surveillance of communication networks. We propose an integer linear programming formulation of the problem based on an exponential family of Clique-Interdiction Cuts and we give necessary and sufficient conditions under which these cuts are facet-defining. Our new approach provides a useful tool for analyzing the resilience of (social) networks with respect to clique-interdiction attacks, i.e., the decrease of the size of the maximum clique as a function of an incremental interdiction budget level. On a benchmark set of publicly available instances, including large-scale social networks with up to one hundred thousand vertices and three million edges, we show that most of them can be analyzed and solved to proven optimality within short computing time.

Mots clés: Maximum clique; Interdiction problems; Combinatorial optimization; (Social) Network analysis; Most vital vertices

Domaines: Informatique [cs]

Fabio Furini, Ivana Ljubić, Sébastien Martin, Pablo San Segundo. The maximum clique interdiction problem. European Journal of Operational Research, 2019, 277 (1), pp.112-127. ⟨10.1016/j.ejor.2019.02.028⟩. ⟨hal-02152302⟩