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I solved it in the similar way, although your solution can be simplified: it's not necessary to store all the elements of the tree in a list, you can just remember one previous value and compare it with the current one in the traversal function: if current is less than previous or equal then it's not BST
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Trees: Is This a Binary Search Tree?
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I solved it in the similar way, although your solution can be simplified: it's not necessary to store all the elements of the tree in a list, you can just remember one previous value and compare it with the current one in the traversal function: if current is less than previous or equal then it's not BST