1. Basic information of merge sort 1. Basic principles Merge sort is an effective sorting algorithm based on merge operations. This algorithm is a very typical application of the divide-and-conquer method. Merge the ordered subsequences to obtain a completely ordered sequence; That is, order each subsequence first, and then order the subsequence segments. Decomposition: Split […]
Tag: merge
Merge Sort merge Sort + diagram + recursive / non-recursive
The main idea of (merge sort) is: to merge gradually several ordered sequences, and finally merge them into one ordered sequence Two-way merge sort(2-way merge sort) is the simplest sorting method in merge sort (1)Recursive implementation of two-way merge sort // Recursive implementation of two-way merge sort void merge(vector<int> & amp; arr,int left, int mid, […]
JAVA New Practice 4: Use JAVA to write a map tile download program and merge the tiles into large images in different levels
This article is full of work and uses code directly to show you how to write an autonomous and controllable map tile download program in Java, and merge the tiles into a large image hierarchically so that you can deploy your own tile map in geoserver. The environment covered in this article is as follows: […]
Detailed process of pure front-end export to Excel (including export by column + table with style + table merge + table nested table + two sheets in Chinese and English)
1. Foreword The vue project is a pure front-end export to Excel. The data structure array contains arrays to export Excel according to the required columns. Using the xlsx-populate plug-in, the exported Excel file: with borders, first column merging, nested tables, and Chinese generation respectively. and english two worksheets. The effect of exporting the table […]
[Data Structure] Recursive and non-recursive implementation of merge sort
Merge sort Preface 1. Recursive implementation of merge sort (1) The core idea of merge sorting Merge sort run legend (2) Core steps of merge sort implementation (3) Detailed explanation of merge sorting code source (4) Merge sort efficiency analysis 1) Time complexity O(N*logN) 2) Space complexity O(N) Stability: Very stable 2. Non-recursive implementation of […]
Github branch handles stash, rebase, merge, fastforward and branch code submission to the main branch
Directory 1 Three areas for git file storage 2 git simple submission format and query and modification of three location files 3 git rebase 4 git merge 5 Differences between merge and rebase 6 git stash 7 Applications under development 1 Three areas for git file storage Git’s file storage is divided into three areas, […]
Three types of index merge optimization in MySQL? Or can indexes be used?
MySQL’s 3 types of index merging and optimization Or can it use indexes? Foreword Previously, we discussed various ways for MySQL to optimize table return: pushing down ICP under index conditions, multi-range read MRR, covering index, etc. In this article, let’s talk about another method provided by MySQL to optimize table return: index merge index […]
el-table merges cells while lazily loading the table
<!DOCTYPE html> <html> <head> <meta charset=”UTF-8″> <!– import CSS –> <link rel=”stylesheet” href=”https://unpkg.com/element-ui/lib/theme-chalk/index.css”> </head> <body> <div id=”app”> <div> <div class=”preview app-container” ref=”preview”> <el-table :data=”tableData” height=”900″ :header-cell-style=”handerMethod” :span-method=”objectSpanMethod” border fit highlight-current-row style=”margin-top: 10px;” row-key=”id” lazy :load=”load” :tree-props=”{children:’children’,hasChildren:’hasChildren’}” @expand-change=”expandChange”> <el-table-column prop=’firstRisk’ label=’Level 1 Risk’ align=”center” type=”” :show-overflow-tooltip=”true”></el-table-column> <el-table-column prop=’secRisk’ label=’Second-level risk’ align=”center” type=”” :show-overflow-tooltip=”true”></el-table-column> <el-table-column prop=” label=’Early […]
[Data structure binary tree] Pre-order level establishment, recursive non-recursive traversal, level-order traversal, tree height, mirror, symmetry, subtree, merge, target path, weighted path sum, etc.
Binary tree Article directory Binary tree 1. Creation of binary tree (recursive creation, structure pointer form) 1.1. Preorder establishment 1.2. Establishment of layer sequence 2. Recursive traversal (structure pointer) 2.1. Preorder traversal 2.2. In-order traversal 2.3. Postorder traversal 3. Non-recursive traversal (structure pointer) 3.1. Level traversal 3.2. Postorder traversal (non-recursive) 4. Find the height of […]
“Image merge” creates data out of nothing
When working on a new project, there is often a lack of real data, which makes it impossible to train the model. At this time, algorithm engineers need to create some data by themselves. For example, in the bag target detection shared in this article, there is no real bag in the detection area. data […]