class Solution:
def invertTree(self, root) :
if not root:
return root
left, right = self.invertTree(root.left), self.invertTree(root.right)
root.left, root.right = right, left
return root
const invertTree = (root) => {
if (!root) {
return root;
}
let [left, right] = [invertTree(root.left), invertTree(root.right)];
[root.left, root.right] = [right, left];
return root;
};