[LeetCode] Closest Binary Search Tree Value 最近的二分搜索树的值

原题链接在这里:https://leetcode.com/problems/closest-binary-search-tree-value/ Given a non-empty binary search tree and a target value, find the value in the BST that is closest to the target. Note: Given target value is a floating point. You are guaranteed

Given a non-empty binary search tree and a target value, find k values in the BST that are closest to the target. Note: Given target value is a floating point. You may assume k is always valid, that is: k ≤ total nodes. You are guaranteed to have onl

Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: next() and hasNext() should run in average O(1) time and uses

LeetCode: Validata Binary Search Tree Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree o

LeetCode: Recover Binary Search Tree Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. Note: A solution using O(n) space is pretty straight forward. Could you devise a constant space s

Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree of a node contains only nodes with keys greater than the node's key. Both the left and right subtrees must also b

/* * 272. Closest Binary Search Tree Value II * 2016-6-25 by Mingyang * 一开始这个题目我想用priority queue来做,就是把所有的stack里面的全部加进来 * 然后一个一个的找 */ public List<Integer> closestKValues1(TreeNode root, double target, int k) { Stack<TreeNode> stack = new Stack&

/* * 270. Closest Binary Search Tree Value * 2016-6-25 by Mingyang */ public int closestValue(TreeNode root, double target) { int closest = root.val; double min = Double.MAX_VALUE; while(root!=null) { if( Math.abs(root.val - target) < min ) { min = M

[题目] Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree of a node contains only nodes with