Stooge Sort Algorithm in C

This C program sorts a given array of integer numbers using Stooge Sort technique.
Stooge sort is a recursive sorting algorithm with a time complexity of O(n^{log 3 / log 1.5}). The running time of the algorithm is thus extremely slow compared to efficient sorting algorithms, such as Merge sort, and is even slower than Bubble sort, a canonical example of a fairly inefficient and simple sort.

Here is the source code of the C program to sort integers using Stooge Sort technique. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
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 * C Program to Perform Stooge Sort
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 */
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```
#include <stdio.h>
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void stoogesort(int [], int, int);
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```
 
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void main()
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{
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    int arr[100], i, n;
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```
 
```

    printf("How many elements do you want to sort: ");

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    scanf("%d", &n);
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    for (i = 0;i < n; i++)
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        scanf(" %d", &arr[i]);
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    stoogesort(arr, 0, n - 1);
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    printf("Sorted array : \n");
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    for (i = 0;i < n;i++)
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    {
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        printf("%d ", arr[i]);
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    }
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    printf("\n");
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}
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```
 
```
```
 
```

void stoogesort(int arr[], int i, int j)

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{
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    int temp, k;
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    if (arr[i] > arr[j])
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    {
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        temp = arr[i];
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        arr[i] = arr[j];
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        arr[j] = temp;
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    }
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    if ((i + 1) >= j)
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        return;
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    k = (int)((j - i + 1) / 3);
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    stoogesort(arr, i, j - k);
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    stoogesort(arr, i + k, j);
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    stoogesort(arr, i, j - k);
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}
```

$ gcc stoogesort.c -o stoogesort
$ ./stoogesort
 
How many numbers you want to sort: 5
 
Enter 5 numbers : 755 32 20 35 333
 
Sorted array is : 20 32 35 333 755

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