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Leetcode:Symmetric Tree 判断对称树
Symmetric Tree
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
解题分析:
二叉树递归,始终是第一颗二叉树的左子树和第二颗二叉树的右子树相比较
class Solution {public: bool isSymmetric(TreeNode *root) { if (root == nullptr) return true; return SymmeFunc(root->left, root->right); } bool SymmeFunc(TreeNode* left, TreeNode* right) { if (left == nullptr && right == nullptr) { return true; } else if (left != nullptr && right != nullptr) { return ((left->val == right->val) && SymmeFunc(left->left, right->right) && SymmeFunc(left->right, right->left)); } else { return false; } }};
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