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. 直观地一想.查找第k小的数,不就是遍历到第k个数吗?所以中序遍历非常easy想到,例如以下: /** * Definition for a binary tree…
题目大意 https://leetcode.com/problems/kth-smallest-element-in-a-bst/description/ 230. 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 assume k is always valid,…
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 nee…
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. Example 1: Input: root = [3,1,4,null,2], k = 1 3 / \ 1 4 \ 2 Output: 1 Example 2:…
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…
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. 问题:找出二叉搜索树种第 k 小的元素. 一个深度遍历的应用.使用递归.或者借助栈都可以实现深度遍历.本文代码使用递归实现. void visit(TreeNode*…
解题思路: 直接修改中序遍历函数即可,JAVA实现如下: int res = 0; int k = 0; public int kthSmallest(TreeNode root, int k) { this.k = k; inorderTraversal(root); return res; } public List<Integer> inorderTraversal(TreeNode root) { List<Integer> list = new ArrayList<…
