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LeetCode-101. Symmetric Tree
2022-08-10 15:36:00 【51CTO】
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:
But the following [1,2,2,null,3,null,3]
is not:
Note:
Bonus points if you could solve it both recursively and iteratively.
题解:
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