图论是数学的一个重要的分支，它以图为研究对象，研究定点和变组成的图形的数学理论和方法，而且现在图论在计算机科学中也扮演着及其重要的角色。宽度优先算法能解决图论中的许多问题，其中之一就是寻找图中所有连接元件。-Number theory is an important branch of mathematics, it Pictured research object, fixed point math theory and method of varying the composition and graphics, and now graph theory in computer science also plays and important role. Breadth-first algorithm can solve many problems in graph theory, one of which is to find all of the connecting element in FIG.