哈密顿图的判定：经过图中所有顶点一次且仅一次的回路称为哈密顿回路。具有哈密顿回路的图称为哈密顿图，-determine Hamiltonian graph : After all the vertices of a graph and only one loop is called Hamiltonian circuit. A graph that has a Hamiltonian circuit is　called a Hamiltonian map,