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Main.java
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Main.java
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package com.company;
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
public class Main {
public static void main(String[] args) {
int[] nums = {-10, -3, 0, 5, 9};
sortedArrayToBST(nums);
}
public static TreeNode sortedArrayToBST(int[] nums) {
return dfs(nums, 0, nums.length - 1);
}
public static TreeNode dfs(int[] nums, int li, int hi){
if(hi < li) return null;
int index = (hi - li) / 2 + li;
TreeNode root = new TreeNode(nums[index]);
root.left = dfs(nums, li, index - 1);
root.right = dfs(nums, index + 1, hi);
return root;
}
}