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LeetCode-两棵二叉搜索树的所有元素
注:LeetCode--树专题。 题目链接(1305):https://leetcode-cn.com/problems/all-elements-in-two-binary-search-trees/ 题目描述: 给你 root1 和 root2 这两棵二叉搜索树。 请你返回一个列表,其中包含 两 ...
分类:其他好文   时间:2020-03-27 21:47:16    阅读次数:80
POJ3585 Accumulation Degree(二次扫描与换根法)
Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a specific ather-sheltered ecosy ...
分类:其他好文   时间:2020-03-26 23:12:43    阅读次数:109
[leetcode]1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
[leetcode]1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree 链接 "leetcode" 描述 Given two binary trees original and cloned and giv ...
分类:其他好文   时间:2020-03-25 19:39:53    阅读次数:70
LeetCode 300. Longest Increasing Subsequence
300. Longest Increasing Subsequence(最长上升子序列) 链接 https://leetcode cn.com/problems/merge two binary trees 题目 给定一个无序的整数数组,找到其中最长上升子序列的长度。 示例: 输入: [10,9,2 ...
分类:其他好文   时间:2020-03-14 10:48:26    阅读次数:54
100. Same Tree
Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally ident ...
分类:其他好文   时间:2020-03-06 15:05:00    阅读次数:54
leetcode96 Unique Binary Search Trees
1 """ 2 Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? 3 Example: 4 Input: 3 5 Output: 5 6 Explanation: ...
分类:其他好文   时间:2020-03-04 23:30:47    阅读次数:60
MySql索引底层原理
索引在生活中最常见的概念,无论是字典,还是图书馆藏书查找,根据索引能节约我们的时间。索引是一种为了高效获取数据的数据结构。要了解数据库索引的底层原理,我们就得先了解一种叫树的数据结构,而树中很经典的一种数据结构就是二叉树。 一、二叉树(Binary Search Trees) 二叉树是每个结点最多有 ...
分类:数据库   时间:2020-03-04 23:03:24    阅读次数:108
CF-div2-620-E. 1-Trees and Queries LCA 树上点距离
思路 树链剖分求出LCA 用LCA求两点之间距离(借助到根的距离):depth[x] + depth[y] 2 depth[LCA]; 加边后a,b两点可以保持距离为k的条件: k =改变后的距离; 改变后的距离刚好等于k,如果不等那么距离相差偶数,来回走来走去就能走到走凑成k 考虑加边对a,b距离 ...
分类:其他好文   时间:2020-02-29 20:56:01    阅读次数:70
PolandBall and Forest
PolandBall lives in a forest with his family. There are some trees in the forest. Trees are undirected acyclic graphs with k vertices and k?-?1 edges, ...
分类:数据库   时间:2020-02-27 00:38:52    阅读次数:97
CF1304E 1-Trees and Queries
E. 1 Trees and Queries "原题" Problem Restatement 给出一个$n$个节点的树,每次询问,连结$x$与$y$节点,问$a$到$b$节点是否存在一条路径,使得长度为$k$(点和边 可重复走)。 $( 3 \le n \le 10^5, 1 \le q \le ...
分类:其他好文   时间:2020-02-25 19:50:14    阅读次数:39
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