AOE网关键路径（Activity On Edge） 数据结构其中前两个数代表两个顶点之间的通路，后两个数分别代表最早开始时间和最迟开始时间 带有*的通路组成关键路径；

-Key path AOE Gateway (Activity On Edge) the first two of which data structure to represent the path between two vertices, the number of the latter two represent the earliest start time and the latest start time with a* critical path component of the pathway