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Given preorder traversal of a BST, how can we identify the leaf nodes without building the tree?

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Given preorder traversal of a BST, how can we identify the leaf nodes without building the tree?
posted Feb 16, 2017 by anonymous

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Given root of a Binary Tree along with two integer values. Find the LCA of two nodes with values of the given integers..

Given the root of a Binary Tree along with two integer values. Assume that both integers are present in the tree.
Find the LCA (Least Common Ancestor) of the two nodes with values of the given integers.
2 pass solution is easy. You must solve this in a single pass.

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