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...
classSolution {public:intkthSmallest(TreeNode* root,intk) {returnkthSmallestDFS(root, k); }intkthSmallestDFS(TreeNode* root,int&k) {if(!root)return-1;intval = kthSmallestDFS(root->left, k);if(k ==0)returnval;if(--k ==0)returnroot->val;returnkthSmallestDFS(root->right, k); } ...
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...
https://leetcode.com/problems/kth-smallest-element-in-a-bst/ Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may ...[LeetCode] 230. Kth Smallest Element in a BST @ python 一.题目: 给定一颗二叉查找树,找到其中第k小的元素并...
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...
题目链接:https://leetcode.com/problems/kth-smallest-element-in-a-bst/ 题目: 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 ...
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. (1 ≤ k ≤ BST’s total elements) Java Solution 1 – Inorder Traversal We can inorder traverse the tree and get the kth smallest element. Time is O(n). ...
题目地址:https://leetcode.com/problems/kth-smallest-element-in-a-bst/#/description 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 ...
publicclassSolution{publicintkthSmallest(int[][]matrix,int k){if(matrix.length==0||matrix[0].length==0)return0;int[]index=newint[matrix.length];int pos=0;int small=matrix[matrix.length-1][matrix[0].length-1];;for(;k>0;k--){small=matrix[matrix.length-1][matrix[0].length-1];fo...
230. Kth Smallest Element in a BST Given a binary search tree, write a functionkthSmallestto find thekth smallest element in it. Example 1: 代码语言: rootkOutput Example 2: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Input:root=[5,3,6,2,4,null,null,1],k=35/\36/\24/1Outpu...