采用数据结构中的AOE方法对图的关键路径进行计算，此算法摘录了课本中的算法-using the data structure to map AOE method of calculation of critical path, this algorithm extracts from the books of Algorithm

关键路径问题，用二叉树的方法去实现如何和查找关键的路途，帮助你怎样选择最佳路径。-Critical path problem, the binary tree method to achieve and how to find the key to the road, to help you how to choose the best path.