For a positive integer d,an L(d,1)-labeling of a graph Gis an assignment of nonnegative integers to the vertices of V(G)such that the difference between labels of adjacent vertices is at least d,and the difference between labels of vertices whose distance are two aparts is at least 1.The span of an L(d,1)-labeling of a graph Gis the difference between the maximum and minimum integers of all labels.The L(d,1)-labeling-number of Gis the minimum span over all L(d,1)-labelings of G.Based on the work of L(d,1)-l...