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google search
Google search results:
1: https://www.geeksforgeeks.org/construct-bst-from-given-preorder-traversa/
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2: https://www.geeksforgeeks.org/tree-traversals-inorder-preorder-and-postorder/
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3: https://www.techiedelight.com/build-binary-search-tree-from-preorder-sequence/
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4: https://coderbyte.com/algorithm/tree-traversal-algorithms
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5: https://www.tutorialcup.com/interview/tree/construct-bst-from-given-preorder-traversal.htm
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6: https://ideone.com/fork/15y1tp
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7: https://java2blog.com/binary-tree-preorder-traversal-in-java/
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8: https://www.journaldev.com/35001/binary-tree-traversal-preorder-inorder-postorder
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