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Editor to share with you how to achieve merger and sorting in web development, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Merge and sort

Merge sorting (Merge sort) is an effective sorting algorithm based on merge operation. This algorithm is a very typical application of divide-and-conquer (Divide and Conquer).

As a typical algorithm application of divide-and-conquer idea, merge sorting is realized by two methods:

Top-down recursion (all recursive methods can be iteratively rewritten, so there is a second method)

Bottom-up iteration

Like selective sorting, the performance of merge sorting is not affected by the input data, but it performs much better than selective sorting, because it is always O (nlogn) time complexity. The cost is that extra memory space is required.

Algorithm step

Apply for space so that it is the sum of two sorted sequences, which is used to store the merged sequence

Set two pointers, initially at the start of the two sorted sequences

Compare the elements pointed to by the two pointers, select the relatively small elements to put into the merge space, and move the pointer to the next location

Repeat step 3 until a pointer reaches the end of the sequence

Copy all the remaining elements of another sequence directly to the end of the merge sequence.

Source: https://github.com/hustcc/JS-Sorting-Algorithm

Algorithm demonstration

The animation is a little slow to load. Please wait a moment.

Process interpretation of sorting animation

First, divide the number into two regions

And then divide the number into two regions.

Divide in turn

Until there is only one element per area.

Segmentation complete

Next, each segmented area is merged and combined.

When merging, move according to the ascending order of numbers, so that the merged numbers are arranged in ascending order within the group.

When merging groups that contain multiple numbers, compare the first numbers and move the smaller ones

For example, in animation, compare the first 4 and 3.

Where 4 is greater than 3, so move 3

Compare the remaining headers of the column according to the same logic

4 is less than 7, so move 4

The same logic to do the next thing.

Recursively repeats the group merge operation until all the numbers are in one group.

Complete the merge sort

Code implementation

In order to better let readers use their familiar programming language to understand animation, the author will post the reference code of a variety of programming languages, all from the Internet.

C++ code implementation

Java code implementation

Python code implementation

JavaScript code implementation

These are all the contents of the article "how to merge and sort in web Development". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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