给定一个有序整数数组，元素各不相同且按升序排列，编写一个算法，创建一棵高度最小的二叉搜索树。

    public TreeNode sortedArrayToBST(int[] nums) {if(nums.length==0) return null;return BST(nums,0,nums.length-1);}public TreeNode BST(int[] nums,int left,int right) {if(left>right) return null;if(left==right) return new TreeNode(nums[left]);int mid=left+((right-left)>>1);TreeNode treeNode=new TreeNode(nums[mid]);treeNode.right=BST(nums,mid+1,right);treeNode.left=BST(nums,left,mid-1);return treeNode;}