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Yudong Jin 2024-07-26 16:40:31 +08:00 committed by GitHub
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@ -293,13 +293,13 @@ It can be observed that **the right and left rotation operations are logically s
For the unbalanced node 3 shown in the figure below, using either left or right rotation alone cannot restore balance to the subtree. In this case, a "left rotation" needs to be performed on `child` first, followed by a "right rotation" on `node`. For the unbalanced node 3 shown in the figure below, using either left or right rotation alone cannot restore balance to the subtree. In this case, a "left rotation" needs to be performed on `child` first, followed by a "right rotation" on `node`.
![Right-left rotation](avl_tree.assets/avltree_left_right_rotate.png) ![Left-right rotation](avl_tree.assets/avltree_left_right_rotate.png)
### Right-left rotation ### Right-left rotation
As shown in the figure below, for the mirror case of the above unbalanced binary tree, a "right rotation" needs to be performed on `child` first, followed by a "left rotation" on `node`. As shown in the figure below, for the mirror case of the above unbalanced binary tree, a "right rotation" needs to be performed on `child` first, followed by a "left rotation" on `node`.
![Left-right rotation](avl_tree.assets/avltree_right_left_rotate.png) ![Right-left rotation](avl_tree.assets/avltree_right_left_rotate.png)
### Choice of rotation ### Choice of rotation