symmetric-tree Java code
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Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).
For example, this binary tree is symmetric:
1
/ \
2 2
/ \ / \
3 4 4 3
But the following is not:
1
/ \
2 2
\ \
3 3
Note:
Bonus points if you could solve it both recursively and iteratively.
confused what”{1,#,2,3}”means? > read more on how binary tree is serialized on OJ.
OJ’s Binary Tree Serialization:
The serialization of a binary tree follows a level order traversal, where ‘#’ signifies a path terminator where no node exists below.
Here’s an example:
1
/ \
2 3
/
4
\
5
The above binary tree is serialized as”{1,2,3,#,#,4,#,#,5}”.
/** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */public class Solution { public boolean isSymmetric(TreeNode root) { if(root==null){ return true; } return same(root.left,root.right); } public boolean same(TreeNode l,TreeNode r){ if(l==null&&r==null){ return true; }else if(l==null&&r!=null){ return false; }else if(l!=null&&r==null){ return false; }else { if(l.val==r.val){ return same(l.left,r.right)&&same(l.right,r.left); }else { return false; } } }}
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