12. Graph G is a non-connected undirected graph with 28 edges in total, so the graph has at least () vertices.
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13. Given the adjacency matrix representation of a graph, the method to delete all the starting points from the i-th vertex is ().
A. Set all the elements on the i-th row of the matrix to 0
B. Set all the elements on the i-th column of the matrix to 0
C. Delete the i-th row of the matrix, and move the subsequent rows up
Delete the i-th column of the matrix, and move the subsequent column up
14. Depth-first traversal is similar to binary tree ().
A. Traversal
B. Preorder traversal
C. In-order traversal
D. Post-order traversal
15. Breadth-first traversal is similar to binary tree ().
A. Preorder traversal
B. In-order traversal
C. Post-order traversal
D. Traversal
16. In the representation of a graph, only has one representation is ().
Adjacency matrix representation
B. Adjacency list representation
C. Reverse adjacency list representation
D. Adjacency list and inverse adjacency list representation
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