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There is no discrepency here. Both statements hold. In the tree there can be equivalent values. If during your search you encounter equivalent values, it IS a binary tree; however, it IS NOT a BST. That would be the difference. In the case of the equivalent values you would return 0.
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Trees: Is This a Binary Search Tree?
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There is no discrepency here. Both statements hold. In the tree there can be equivalent values. If during your search you encounter equivalent values, it IS a binary tree; however, it IS NOT a BST. That would be the difference. In the case of the equivalent values you would return 0.