- Leetcode-108Convert Sorted Array
- 108. Convert Sorted Array to Bin
- leetcode:108. Convert Sorted Arr
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
- 108. Convert Sorted Array to Bin
https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/description/
解题思路：
用preorder traversal来解决
代码：
class Solution {
public TreeNode sortedArrayToBST(int[] nums) {
if(nums == null || nums.length == 0) return null;
return helper(nums, 0, nums.length - 1);
}
public TreeNode helper(int[] nums, int low, int high){
if(low > high) return null;
int mid = (high - low) / 2 + low;
TreeNode node = new TreeNode(nums[mid]);
node.left = helper(nums, low, mid - 1);
node.right = helper(nums, mid + 1, high);
return node;
}
}
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