Binary Tree Upside Down
2015-06-16 03:27
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网上抄的 http://blog.csdn.net/whuwangyi/article/details/43186045
Given a binary tree where all the right nodes are either leaf nodes with a sibling (a left node that shares the same parent node) or empty, flip it upside down and turn it into a tree where the original right nodes turned into left leaf nodes. Return the new root.
For example:
Given a binary tree {1,2,3,4,5},
1
/ \
2 3
/ \
4 5
return the root of the binary tree [4,5,2,#,#,3,1].
4
/ \
5 2
/ \
3 1
一看就懵了,要弄what咧,貌似是,orig.->new: right->left, left ->parent, parent->right, node->parent
直接copy 人家的code
地址
http://blog.csdn.net/whuwangyi/article/details/43186045
“第二个思路是直接用迭代代替递归,做起来也不麻烦,并且效率会更高,因为省去了递归所用的栈空间。
”
Given a binary tree where all the right nodes are either leaf nodes with a sibling (a left node that shares the same parent node) or empty, flip it upside down and turn it into a tree where the original right nodes turned into left leaf nodes. Return the new root.
For example:
Given a binary tree {1,2,3,4,5},
1
/ \
2 3
/ \
4 5
return the root of the binary tree [4,5,2,#,#,3,1].
4
/ \
5 2
/ \
3 1
一看就懵了,要弄what咧,貌似是,orig.->new: right->left, left ->parent, parent->right, node->parent
直接copy 人家的code
地址
http://blog.csdn.net/whuwangyi/article/details/43186045
“第二个思路是直接用迭代代替递归,做起来也不麻烦,并且效率会更高,因为省去了递归所用的栈空间。
public TreeNode UpsideDownBinaryTree(TreeNode root) { TreeNode node = root, parent = null, right = null; while (node != null) { TreeNode left = node.left; node.left = right; right = node.right; node.right = parent; parent = node; node = left; } return parent; }
”
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