主题链接:pid=2454">http://acm.hdu.edu.cn/showproblem.php?pid=2454 Problem Description Wang Haiyang is a strong and optimistic Chinese youngster. Although born and brought up in the northern inland city Harbin, he has deep love and yearns for the bound
Graph Reconstruction Time Limit: 2 Seconds Memory Limit: 65536 KB Special Judge Let there be a simple graph with N vertices but we just know the degree of each vertex. Is it possible to reconstruct the graph only by these information? A sim
团饱和图:(一)EHM定理 据A. Hajnal考证,术语"饱和性",即saturation,最早由前苏联数学家A. A. Zykov在1949年引入,用于研究线性复形,但是他的工作并没有引起图论学家的足够关注.1961年,P. Erdos和T. Gallai在研究顶点覆盖问题时提出了一个猜想,而这个猜想事实上使用了图饱和数的概念(但并没有使用该术语),这个猜想在1964年被P. Erdos,A. Hajnal和J. W. Moon证明,我们称为EHM定理.随后在1965年,A. Ha