我有以下二叉树，我正在尝试使用最少的树旋转次数将其转换为目标二叉树（帖子中的第二棵树）。这棵树的理论最小旋转数是 5，但是，我能算出的最小值是 6 旋转，我也复制了旋转，我错过了什么？
树：
1
\
\
3
/ \
/ \
2 5
/ \
/ \
4 7
/ \
/ \
6 11
/ \
/ \
9 12
/ \
8 10
目标树：
1
\
\
11
/ \
/ \
9 12
/ \
/ \
3 10
/ \
/ \
2 5
/ \
/ \
4 7
/ \
6 8
到目前为止我尝试过的旋转（所有这些都需要 6 次旋转）：
订单 1：
Rotate left with root 7 and pivot 11
Rotate left with root 5 and pivot 11
Rotate left with root 3 and pivot 11
Rotate left with root 7 and pivot 9
Rotate left with root 5 and pivot 9
Rotate left with root 3 and pivot 9
订单 2：
Rotate left with root 7 and pivot 11
Rotate left with root 5 and pivot 11
Rotate left with root 7 and pivot 9
Rotate left with root 3 and pivot 11
Rotate left with root 5 and pivot 9
Rotate left with root 3 and pivot 9
订单3：
Rotate left with root 7 and pivot 11
Rotate left with root 5 and pivot 11
Rotate left with root 7 and pivot 9
Rotate left with root 5 and pivot 9
Rotate left with root 3 and pivot 11
Rotate left with root 3 and pivot 9
订单4：
Rotate left with root 7 and pivot 11
Rotate left with root 7 and pivot 9
Rotate left with root 5 and pivot 11
Rotate left with root 3 and pivot 11
Rotate left with root 5 and pivot 9
Rotate left with root 3 and pivot 9
订单5：
Rotate left with root 7 and pivot 11
Rotate left with root 7 and pivot 9
Rotate left with root 5 and pivot 11
Rotate left with root 5 and pivot 9
Rotate left with root 3 and pivot 11
Rotate left with root 3 and pivot 9