通过Astart算法了解对图结构、堆栈、队列、优先级队列等数据结构，并通过回溯过程解决罗马尼亚假日问题。问题内容是通过Astart算法，遍历所有节点（地点），寻找最短路径。-Astart algorithm to understand the structure of the map, stack, queue, priority queue and other data structures, and through the backtracking process to solve the