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[Amazon Phone]Least Common Ancestor Of Multiple Nodes

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Given a binary tree and a list of nodes say [n1, n2, .. nk], write a program to find the least common ancestor.
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Solve the problem:


# Definition for a binary tree node. # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None def lca(root, vals):





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