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...
*/publicclassSolution{publicintkthSmallest(TreeNoderoot,intk){if(root==null){return-1;}TreeNodecurr=root;while(curr!=null){intleft=count(curr.left);if(left<k-1){k=k-left-1;curr=curr.right;}elseif(left>k-1){curr=curr.left;}else{returncurr.val;}}return-1;}privateintcount(TreeNode...
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,...
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 ...
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: Whatifthe BST is modified (insert/delete operations) often and you need to find the kth smallest frequentl...
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...
https://leetcode.com/problems/kth-smallest-element-in-a-bst/description/ 解题方法: 用中序遍历整个树,因为会优先遍历到最小的节点,然后再--k,看在哪个节点上k == 0,则用全局变量记录这个节点。 Time Complexity: O(N) 完整代码: intkthSmallest(TreeNode*root,intk){intresult=0;boolfind=false;helpe...
题目来源: https://leetcode-cn.com/problems/kth-smallest-element-in-a-bst/ 题目描述: 代码如下: 【Leetcode_总结】230. 二叉搜索树中第K小的元素 - python Q: 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...
Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: ...