Given a binary search tree, write a functionkthSmallestto find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you need to find the kth smallest frequ...
* }*/classSolution {privateintcount = 0;privateintres = -1;publicintkthSmallest(TreeNode root,intk) { inorder(root, k);returnres; }privatevoidinorder(TreeNode root,intk) {if(root.left !=null) { inorder(root.left, k); }if(++count ==k) { res=root.val;return; }if(root.right ...
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you need to find the kth smallest f...
publicclassSolution{privateTreeNodekthNode=null;privateintcount=0;publicintkthSmallest(TreeNoderoot,intk){if(root==null)return0;find(root,k);returnkthNode.val;}privatevoidfind(TreeNoderoot,intk){if(root.left!=null)find(root.left,k);count++;if(count==k){kthNode=root;return;}if(root.right!
intnum=0;intres;publicintkthSmallest(TreeNoderoot,intk){inorderTraversal(root,k);returnres;}privatevoidinorderTraversal(TreeNodenode,intk){if(node==null){return;}inorderTraversal(node.left,k);num++;if(num==k){res=node.val;return;}inorderTraversal(node.right,k);} ...
class Solution { public: int pos; int ans; int kthSmallest(TreeNode* root, int k) { DFS(root,k); return ans; } void DFS(TreeNode* root,int k) { if(root->left!=NULL) { DFS(root->left,k); } pos++; if(pos==k) {
The optimal runtime complexity is O(height of BST). 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Java Solution 1 - Inorder Traversal We can inorder traverse the tree and get the kth smallest element. Time is O(n). ...
Leetcode 230. Kth Smallest Element in a BST 简介:先来看下二叉搜索树的性质,对于任意一个非叶子节点,它的左子树中所有的值必定小于这个节点的val,右子树中所有的值必定大于或等于当前节点的val。 这条性质就保证了如果我们对二叉搜索树做中序遍历,中序遍历的结果肯定是有序的。对于此题而言,我们只需要拿到...
230. Kth Smallest Element in a BST Given a binary search tree, write a functionkthSmallestto find thekth smallest element in it. **Note: ** You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Example 1: 代码语言:javascript ...
Kth Smallest Element in a BST 题目内容 https://leetcode-cn.com/problems/kth-smallest-element-in-a-bst/ 给定一个二叉搜索树,编写一个函数 kthSmallest 来查找其中第 k 个最小的元素。 说明: 你可以假设 k 总是有效的,1 ≤ k ≤ 二叉搜索树元素个数。 题目思路 记住,二叉搜索树可以通过中序遍历...