LeetCode Convert Sorted Array to Binary Search Tree
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题目：
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public: TreeNode *sortedArrayToBST(vector<int> &num) { TreeNode *root = create(num, 0, num.size()-1); return root; }private:TreeNode *create(vector<int> &num, int begin, int end) {if(begin <= end) {int mid = begin + (end-begin)/2;TreeNode *root = new TreeNode(num[mid]);root->left = create(num, begin, mid-1);root->right = create(num, mid+1, end);return root;}else return NULL;}}; 0 0
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