【使用排序数组/链表/preorder构建二叉搜索树】的更多相关文章

使用排序数组/链表/preorder构建二叉搜索树

2018-08-13 11:29:05 一.Convert Sorted Array to Binary Search Tree 问题描述: 问题求解: public TreeNode sortedArrayToBST2(int[] nums) { if (nums == null || nums.length == 0) { return null; } return helper(0, nums.length - 1, nums); } private TreeNode helper (in…

[leetcode]108. Convert Sorted Array to Binary Search Tree构建二叉搜索树

构建二叉搜索树 /* 利用二叉搜索树的特点:根节点是中间的数 每次找到中间数,左右子树递归子数组 */ public TreeNode sortedArrayToBST(int[] nums) { return builder(nums,0,nums.length-1); } public TreeNode builder(int[] nums,int left,int right) { if (left>right) return null; int mid = (left+right)/2;…

[leetcode]109. Convert Sorted List to Binary Search Tree链表构建二叉搜索树

二叉树的各种遍历方式都是可以建立二叉树的,例如中序遍历,就是在第一步建立左子树,中间第二步建立新的节点,第三步构建右子树 此题利用二叉搜索树的中序遍历是递增序列的特点,而链表正好就是递增序列,从左子树开始递归利用链表的数据 控制平衡是用的递归层数,用left和right来控制 /* 各序遍历也可以建立树 利用二叉搜索树的特点,用中序遍历建立二叉树 */ //要递归listnode,所以要用全局变量 ListNode node; public TreeNode sortedListToBST(Li…

LeetCode OJ：Convert Sorted List to Binary Search Tree（将排序好的链表转换成二叉搜索树）

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 由于对于这个二叉搜索树的要求是其必须是其必须是平衡的,所以应该使用递归.首先找到二叉树的中点.然后由这个中点作为根节点递归的在从左右子树上面取节点构成一颗二叉树.代码如下所示: /** * Definition for singly-linked list. * struct L…

[Leetcode] Convert sorted list to binary search tree 将排好的链表转成二叉搜索树

---恢复内容开始--- Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 题目要求:转成高度平衡的二叉搜索树. 高度平衡的二叉搜索树:i)左子树和右子树的高度之差的绝对值不超过1; ii)树中的每个左子树和右子树都是AVL树; iii)每个节点都有一个平衡因子(balance factor bf),任一节点的平衡因子是1,0,…

[LeetCode] 109. Convert Sorted List to Binary Search Tree 把有序链表转成二叉搜索树

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never diffe…

剑指Offer22 判断数组是否为某二叉搜索树的后序遍历

/************************************************************************* > File Name: 22_SequenceOfBST.cpp > Author: Juntaran > Mail: JuntaranMail@gmail.com > Created Time: 2016年08月30日 星期二 20时34分33秒 ******************************************…

Convert Sorted List to Binary Search Tree——将链表转换为平衡二叉搜索树 &&convert-sorted-array-to-binary-search-tree——将数列转换为bst

Convert Sorted List to Binary Search Tree Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 为了满足平衡要求,容易想到提出中间节点作为树根,因为已排序,所以左右两侧天然满足BST的要求. 左右子串分别递归下去,上层根节点连接下层根节点即可完成. 递归找中点,然后断开前后两段链表,并继续找…

Convert Sorted Array to Binary Search Tree(将一个有序数组转换成一颗二叉搜索树)

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more th…

[LeetCode] 108. Convert Sorted Array to Binary Search Tree 把有序数组转成二叉搜索树

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more th…