0226-invert-binary-tree.c

//递归
struct TreeNode* invertTree(struct TreeNode* root) {
    if(root == NULL) {
        return NULL;
    }
    struct TreeNode *left = invertTree(root->left);
    struct TreeNode *right = invertTree(root->right);
    root->left = right;
    root->right = left;
    return root;
}