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Yudong Jin 2024-07-26 16:39:34 +08:00 committed by GitHub
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en/docs/chapter_tree/avl_tree.md
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@ -289,18 +289,18 @@ It can be observed that **the right and left rotation operations are logically s
[file]{avl_tree}-[class]{avl_tree}-[func]{left_rotate} [file]{avl_tree}-[class]{avl_tree}-[func]{left_rotate}
``` ```
### 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`.
![Left-right rotation](avl_tree.assets/avltree_right_left_rotate.png)
### Left-right rotation ### Left-right rotation
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) ![Right-left rotation](avl_tree.assets/avltree_left_right_rotate.png)
### 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`.
![Left-right rotation](avl_tree.assets/avltree_right_left_rotate.png)
### Choice of rotation ### Choice of rotation
The four kinds of imbalances shown in the figure below correspond to the cases described above, respectively requiring right rotation, left-right rotation, right-left rotation, and left rotation. The four kinds of imbalances shown in the figure below correspond to the cases described above, respectively requiring right rotation, left-right rotation, right-left rotation, and left rotation.