A complete binary tree is a binary tree in which every level, except possibly the last, is completely filled, and all nodes are as far left as possible.
Write a data structure CBTInserter
that is initialized with a complete binary tree and supports the following operations:
CBTInserter(TreeNode root)
initializes the data structure on a given tree with head noderoot
;CBTInserter.insert(int v)
will insert aTreeNode
into the tree with valuenode.val = v
so that the tree remains complete, and returns the value of the parent of the insertedTreeNode
;CBTInserter.get_root()
will return the head node of the tree.
Example 1:
Input: inputs = ["CBTInserter","insert","get_root"], inputs = [[[1]],[2],[]]
Output: [null,1,[1,2]]
Example 2:
Input: inputs = ["CBTInserter","insert","insert","get_root"], inputs = [[[1,2,3,4,5,6]],[7],[8],[]]
Output: [null,3,4,[1,2,3,4,5,6,7,8]]
Note:
- The initial given tree is complete and contains between
1
and1000
nodes. CBTInserter.insert
is called at most10000
times per test case.- Every value of a given or inserted node is between
0
and5000
.
Github 同步地址:
https://github.com/grandyang/leetcode/issues/919
参考资料:
https://leetcode.com/problems/complete-binary-tree-inserter/