【hot100-java】【将有序数组转换为二叉搜索树】
二叉树篇
BST树
递归直接实现。
/**
* Definition for a binary tree node.
* public 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;
* }
* }
*/
class Solution {
public TreeNode sortedArrayToBST(int[] nums) {
return dfs(nums,0,nums.length-1);
}
private TreeNode dfs(int [] nums,int left,int right){
if(left>right){
return null;
}
//以升序数组的中间元素作为根节点root
int mid=(left+right)/2;
TreeNode root = new TreeNode(nums[mid]);
//构建root的左子树与右子树
root.left=dfs(nums,left,mid-1);
root.right=dfs(nums,mid+1,right);
return root;
}
}
原文地址:https://blog.csdn.net/m0_73629042/article/details/142703084
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