Leetcode: Convert Sorted Array to Binary Search Tree

/** * 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) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        if(num.size()==0)            return NULL;        return helper(num,0,num.size()-1);    }         TreeNode* helper(vector<int>& num,int start,int end){        if(start>end)            return NULL;        int middle=start+(end-start)/2;        TreeNode* node=new TreeNode(num[middle]);        node->left=helper(num,start,middle-1);        node->right=helper(num,middle+1,end);        return node;    }};


	
				
	
					   
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