“…Until now, the matching preclusion number of numerous networks were calculated and the corresponding optimal solutions were obtained, such as the complete graph, the complete bipartite graph and the hypercube [6], Cayley graphs generated by 2-trees and hyper Petersen networks [10], Cayley graphs generalized by transpositions and (n, k)-star graphs [11], restricted HL-graphs and recursive circulant G(2 m , 4) [31], tori and related Cartesian products [12], (n, k)-bubble-sort graphs [13], balanced hypercubes [27], burnt pancake graphs [22], k-ary n-cubes [35], cube-connected cycles [25], vertex-transitive graphs [24], n-dimensional torus [23], binary de Bruijn graphs [26] and n-grid graphs [17]. For the conditional matching preclusion problem, it is solved for the complete graph, the complete bipartite graph and the hypercube [6], arrangement graphs [14], alternating group graphs and split-stars [15], Cayley graphs generated by 2-trees and the hyper Petersen networks [10], Cayley graphs generalized by transpositions and (n, k)-star graphs [11], burnt pancake graphs [8,22], balanced hypercubes [27], restricted HL-graphs and recursive circulant G(2 m , 4) [31], k-ary n-cubes [35], hypercube-like graphs [32] and cube-connected cycles [25]. Particularly, Lü et al [28] has proved recently that it is NP-complete to determine the matching preclusion number and conditional matching preclusion number of a connected bipartite graph.…”