leetcode-树练习-symmetric-tree
symmetric-tree
https://www.nowcoder.com/practice/1b0b7f371eae4204bc4a7570c84c2de1?tpId=46&tqId=29077&tPage=1&rp=1&ru=/ta/leetcode&qru=/ta/leetcode/question-ranking
练习过的题目
/**
* Definition for binary tree
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public boolean help(TreeNode left, TreeNode right){
if(left == null && right == null)return true;
if(l
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