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. Follow up: What if the BST is modified (insert/delete operations) often and you need to find the kth smallest frequen...
* }*/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. 求一个二叉搜索树的第k小值。 题目链接:https://leetcode.com/problems/kth-smallest-element-in-a-bst/ 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,...
kthSmallestto 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 frequently? How would you optimize the kthSmallest...
Leetcode 第230题:Kth Smallest Element in a BST--二叉搜索树中第K小的元素(C++、Python) 题目地址:Kth Smallest Element in a BST 题目简介: 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。 示例 1: ...
Leetcode 230 Kth Smallest Element in a BST 思路 由于bst的中序遍历可以得到一个升序的序列,因此对bst进行中序遍历并记录已经遍历过的数字,当遍历过count==k-1时(count初始为0),说明现在正在遍历的是第k小的数字,保存起来等到最后返回即可。 小技巧 需要注意的是在java的值传递方式,将count和result放到数组...
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...
总体上,我们只需要增加两个变量num和res。num记录中序遍历已经输出的元素个数,当num == k的时候,我们只需要将当前元素保存到res中,然后返回即可。 下边分享下三种遍历方式的解法,供参考。 递归法。 intnum=0;intres;publicintkthSmallest(TreeNoderoot,intk){inorderTraversal(root,k);returnres;}privatevoidin...
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 ...
题目描述 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. 方法思路 求一组数中的第K个最小...LeetCode—84. Largest Rectangle in Histogram LeetCode—84. Largest ...