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Help me to find least common ancestor in a BST.

+4 votes
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I have tried bruteforce method but it's complexity is of O(n^2) , i am interested in O(n) or O(nlon n)
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for the tree given above common ancestor of node 1 and 7 is 4. I am much interested in function not the whole program,function shoud take three argument as root of the tree, node1 and node 2

posted Jun 16, 2016 by Shahsikant Dwivedi

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