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GATE | GATE-CS-2000 | Question 14
Consider the following nested representation of binary trees: (X Y Z) indicates Y and Z are the left and right sub stress, respectively, of node X. Note that Y and Z may be NULL, or further nested. Which of the following represents a valid binary tree?
(A)
(1 2 (4 5 6 7))
(B)
(1 (2 3 4) 5 6) 7)
(C)
(1 (2 3 4)(5 6 7))
(D)
(1 (2 3 NULL) (4 5))
Answer
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