Binary Tree Paths
思路：
D&C，很直接
实现：
在整合path的时候用到paths.add(root.val + "->" + path), 当root为叶节点的时候要单独处理。paths.add(""+root.val).
D&C，很直接
实现：
在整合path的时候用到paths.add(root.val + "->" + path), 当root为叶节点的时候要单独处理。paths.add(""+root.val).
776. Split BST
Problem: Given a Binary Search Tree (BST) with root node root , and a target value V , split the tree into two subtrees where one subtree has nodes that are all smaller or equal to the target value, while the other subtree has all nodes that are greater than the target value. It's not necessarily the case that the tree contains a node with value V . Additionally, most of the structure of the original tree should remain. Formally, for any child C with parent P in the original tree, if they are both in the same subtree after the split, then node C should still have the parent P. You should output the root TreeNode of both subtrees after splitting, in any order. Example 1: Input: root = [4,2,6,1,3,5,7], V = 2 Output: [[2,1],[4,3,6,null,null,5,7]] Explanation: Note that root, output[0], and output[1] are TreeNode objects, not arrays. The given tree [4,2,6,1,3,5,7] is represented by the following diagram: 4 / \ ...
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