说明：  现实生活中，常常会遇到求最短路径的问题。本设计旨在提供一种解决这类问题的实例，把某一公园的景点与路线抽象成顶点和边，从而构成图，进而解决一系列相关的最短路径，最佳路线等问题。
(In real life, often encountered in seeking the shortest path problem. This design is intended to provide a solution to an instance of such problems to a park attractions and routes into the abstract vertices and edges, which constitute the map, then the shortest path to solve a series of related, the best routes and other issues.)