很多涉及图上操作的算法都是以图的遍历操作为基础的。试编写一个算法，实现图的深度优先和广度优先搜索遍历操作-Many involved in the operation of the algorithm maps are based on graph-based traversal operation. The preparation of a test algorithm, the realization of plans and the depth-first breadth-first search traversal operation