README_EN.md

101. Symmetric Tree

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Description

Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).

For example, this binary tree [1,2,2,3,4,4,3] is symmetric:

    1

   / \

  2   2

 / \ / \

3  4 4  3

 

But the following [1,2,2,null,3,null,3] is not:

    1

   / \

  2   2

   \   \

   3    3

 

Note:

Bonus points if you could solve it both recursively and iteratively.

Solutions

Python3

Java

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