[leetcode]99. Recover Binary Search Tree恢复二叉搜索树
Two elements of a binary search tree (BST) are swapped by mistake.
Recover the tree without changing its structure.
Example 1:
Input: [1,3,null,null,2] 1
/
3
\
2 Output: [3,1,null,null,2] 3
/
1
\
2
Example 2:
Input: [3,1,4,null,null,2] 3
/ \
1 4
/
2 Output: [2,1,4,null,null,3] 2
/ \
1 4
/
3
Follow up:
- A solution using O(n) space is pretty straight forward.
- Could you devise a constant space solution?
题意:
二叉搜索树中的两个节点被调换了,麻烦给调回来。
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