LeetCode-Easy刷題(23) Convert Sorted Array to Binary Search Tree

阿新 • • 發佈：2018-12-04

Given an array where elements are sorted in ascending order, convert it to a height balanced BST.

將有序陣列轉化為二分查詢樹

 public TreeNode sortedArrayToBST(int[] nums) {

        return toBSTHelp(nums, 0, nums.length-1);
    }


    public TreeNode toBSTHelp(int[] nums,int start,int end){

        if(start>end){
            return null;
        }

        int mid = (start+end)/2;

        TreeNode root = new TreeNode(nums[mid]);

        root.left = toBSTHelp(nums, start, mid-1);
        root.right= toBSTHelp(nums, mid+1, end);

        return root;
    }

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