Symmetric Binary Tree
Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).
Example :
1
/ \
2 2
/ \ / \
3 4 4 3
The above binary tree is symmetric.
But the following is not:
1
/ \
2 2
\ \
3 3
Return 0 / 1 ( 0 for false, 1 for true ) for this problem
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