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then begin
traverse(p↑.left);
process(p);
traverse(p↑.right);
end
end;
A) preorder B) postorder C) reorder D) inorder
(59)Which of the following statements is true regarding simple sort techniques?
( )。
A) exchange sort if frequently referred to as a bubbnle sort .
B) exchange sort is the least expensive.
C) if random data are in an array that is to be sorted ,an insertion sort will
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give then best performance for large elements with small sort items .
D) both insertion sort an selection sort require O(n) moves.
(60) What is the definition of a path?( )。
A) A sequence of vertices and the edges formed by each successive pair of
vertices.
B) A walk with distinct vertices.
C) A walk with distinct edges.
D) None of the above
(61)how many equal valuable relation does set E process?( )。
E= {0,1,2}
A) 3 B) 4 C) 5 D) 6
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