In the traversal of a graph, since any vertex of the graph may be adjacent to other vertices, after visiting a vertex, you may return to the vertex after searching along a certain path. In order to avoid the same vertex being visited multiple times, each visited vertex must be recorded in the process of traversing the graph. Depth-first search starts from a vertex v in the graph, visits this vertex, and then traverses the graph in depth from the unvisited adjacent points of v in turn. The process of traversing the graph is essentially the process of finding the adjacent points of each vertex. The time it takes depends on the storage structure used.
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