Algorithms 2 / 5: Reverse Selection Sort

It has been a while since I have implemented a sorting algorithm - I should probably have implemented these a little bit earlier than I have done :)

Today I bring you the C sharp version of the selection sort I posted earlier. To mix it up a bit htough this implementation is in reverse.

  1. Find the largest number in the sequence
  2. If it is larger than the number at the end of the array, swap them
  3. Find the next largest number
  4. If it is larger than the next number along from the end of the array, swap them
  5. Repeat steps 3 and 4 until all the numbers have been sorted.

Here is the code:

/// <summary>
/// Performs a selection sort on an array of ints.
/// </summary>
/// <param name="array">The array to sort.</param>
static void selection_sort(ref int[] array)
    int limit = array.Length - 1;
    while(limit > 0)
        //find the index with the maximum value
        int max_index = 0; //set the max to the first element in the array
        //don't search the first element in the array, we have already done that on the line above
        for(int i = limit - 1; i > 0; i--)
            if(array[i] > array[max_index])
                max_index = i;
        if(array[max_index] > array[limit])
            //we have found an index with a high value than the current limit
            swap_places(ref array, max_index, limit);


Full Source Code (pastebin) Link to binary (MD5: ef5e0f15c9bc181d36b193160e3f8ad9 SHA1: ad49eb97675ca6ec9cc9dfebb63fbe03cfa27534)

Next up: Insertion sorting.

Tag Cloud

3d 3d printing account algorithms android announcement architecture archives arduino artificial intelligence artix assembly async audio automation backups bash batch blog bookmarklet booting bug hunting c sharp c++ challenge chrome os cluster code codepen coding conundrums coding conundrums evolved command line compilers compiling compression containerisation css dailyprogrammer data analysis debugging demystification distributed computing documentation downtime electronics email embedded systems encryption es6 features ethics event experiment external first impressions future game github github gist gitlab graphics hardware hardware meetup holiday holidays html html5 html5 canvas infrastructure interfaces internet interoperability io.js jabber jam javascript js bin labs learning library linux lora low level lua maintenance manjaro network networking nibriboard node.js operating systems own your code pepperminty wiki performance phd photos php pixelbot portable privacy problem solving programming problems projects prolog protocol protocols pseudo 3d python reddit redis reference releases rendering resource review rust searching secrets security series list server software sorting source code control statistics storage svg talks technical terminal textures thoughts three thing game three.js tool tutorial twitter ubuntu university update updates upgrade version control virtual reality virtualisation visual web website windows windows 10 xmpp xslt


Art by Mythdael