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###### tags: `Leetcode`

# 226. Invert Binary Tree

###### Link : https://leetcode.com/problems/invert-binary-tree/description/

## 題目
將整棵樹變成鏡像的
## 程式碼

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    TreeNode* invertTree(TreeNode* root) {
        Swap(root);
        return root;
    }
    void Swap(TreeNode* node){
        if(!node) return;
        Swap(node->left);
        Swap(node->right);
        swap(node->left, node->right);
        return;
    }
};