Find the lowest common ancestor in an unordered binary tree given two values in the tree.
Lowest common ancestor : the lowest common ancestor (LCA) of two nodes
win a tree or directed acyclic graph (DAG) is the lowest (i.e. deepest) node that has both
_______3______ / \ ___5__ ___1__ / \ / \ 6 _2_ 0 8 / \ 7 4
For the above tree, the LCA of nodes
LCA = Lowest common ancestor
Please note that LCA for nodes
- You are given 2 values. Find the lowest common ancestor of the two nodes represented by
- No guarantee that
val2exist in the tree. If one value doesn’t exist in the tree then return -1.
- There are no duplicate values.
- You can use extra memory, helper functions, and can modify the node struct but, you can’t add a parent pointer.
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.