14 In triple sequence table of sparse matrix, each triple represents ( ).
A. the row number,column number and data value of non-zero elements in the matrix
B. the data value of non-zero elements in the matrix
C. the row and column numbers of elements in the matrix
D. the row number,column number and data value of elements in the matrix
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15 After compressing and storing the following matrix, it is ( ) that loses the random access function.
A. sparse matrix
B. symmetric matrix
C. triangular matrix
D. tridiagonal matrix
1 The most suitable structure for a tree is ().
A. Structure with branches and hierarchical relationships between elements
B. Ordered structure between element
C. Disordered structure between elements
D. Unconnected structure
2 Assuming that the number of nodes of a binary tree is 18, its height is at least ().
A. 4
B. 5
C. 6
D. 18
3 The relative position of the leaf node of any binary tree in its preorder, inorder, and postorder sequence ().
A. Definitely not changed
B. Must change
C. Sometimes changes
D. Unconfirmed
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