/** * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} * }; */ class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param root TreeNode类 * @return TreeNode类 */ TreeNode* invertTree(TreeNode* root) { // write code here if(!root) return root; if(root->left || root->right) { TreeNode* t = root->left; root->left = root->right; root->right = t; } invertTree(root->left); invertTree(root->right); return root; } };