669. Trim a Binary Search Tree 刪除搜尋二叉樹中【L,R】範圍之外的節點
阿新 • • 發佈:2019-01-07
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class Solution {
public TreeNode trimBST(TreeNode root, int L, int R) {
if(root==null) {
return root;
}
if(root.val>=L&&root.val<=R){
root.left=trimBST(root.left,L, R);
root.right=trimBST(root.right,L, R);
return root;
}
else if(root.val<L){
root=trimBST(root.right,L, R);
return root;
}
else{
root=trimBST(root.left,L, R);
return root;
}
}
}
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class Solution {
public TreeNode trimBST(TreeNode root, int L, int R) {
if(root==null) {
return root;
}
if(root.val>=L&&root.val<=R){
root.left=trimBST(root.left,L, R);
root.right=trimBST(root.right,L, R);
return root;
}
else if(root.val<L){
root=trimBST(root.right,L, R);
return root;
}
else{
root=trimBST(root.left,L, R);
return root;
}
}
}