## Topic description

Given a binary search tree, find the kth largest node in it. For example, in 5 / \ 3 7 /\ /\ 2 4 6 8, the value of the third node in the numerical order of the nodes is 4.

Experimental platform: Niuke.com

## Solutions:

java:

``````/*
public class TreeNode {
int val = 0;
TreeNode left = null;
TreeNode right = null;

public TreeNode(int val) {
this.val = val;
}
}
*/
public class Solution {
int k = 0;

TreeNode KthNode(TreeNode pRoot, int k) {
if (pRoot == null || k == 0) {
return null;
}
this.k = k;
return getKthNode(pRoot);
}

TreeNode getKthNode(TreeNode pRoot) {
TreeNode target = null;
if (pRoot.left != null) {
target = getKthNode(pRoot.left);
}
if (target == null) {
if (k == 1) {
target = pRoot;
} else {
k--;
}
}
if (target == null && pRoot.right != null) {
target = getKthNode(pRoot.right);
}
return target;
}
}``````

python:

``略``

### Guess you like

Origin http://43.154.161.224:23101/article/api/json?id=324774411&siteId=291194637
Recommended
Ranking
Daily