951. Flip Equivalent Binary Trees.cpp

 bool flipEquiv(TreeNode* root1, TreeNode* root2) {
         if(root1 == NULL && root2 == NULL)
            return true;
        
        if(root1 == NULL || root2 == NULL) {
            return false;
        }

        if(root1 -> val == root2->val) {
            return flipEquiv(root1->left, root2->left) && flipEquiv(root1->right, root2->right) ||
                   flipEquiv(root1->left, root2->right) && flipEquiv(root1->right, root2->left);
        }

        return false;
    }