经典的匹配算法，涉及到图和网的组合数学知识，优化设计离不开．-classic matching algorithm, involving map and the net portfolio of mathematical knowledge, optimizing the design can not do without.

图论中二种遍历图的算法.深度优先遍历,与广度优先遍历.-graph theory two species traverse map algorithm. Depth-first traversal, and the breadth - first traversal.