How to sort an array in a single loop?

Question

So I was going through different sorting algorithms. But almost all the sorting algorithms require 2 loops to sort the array. The time complexity of Bubble sort & Insert

Answer 1

Sorting an array using single loop (javascript)

var arr = [4,5,2,10,3,7,11,5,1];
for(var i = 1; i < arr.length; i++)
{       
    if(arr[i] < arr[i-1])
    {
        arr[i] = arr[i] + arr[i-1];
        arr[i-1] = arr[i] - arr[i-1]; 
        arr[i] = arr[i] - arr[i-1];              
        i=0;
    } 
}

output : arr = [1, 2, 3, 4, 5, 5, 7, 10, 11]

Answer 2

    #include<stdio.h>

    void sort(int a[],int n,int k,int w)
    {   
      int i,j,z,key;
      n=n-1;
      j = k+1;
      key = a[j];
      i = j-1;
      while(i>0 && a[i]>key)
      {
        a[i+1] = a[i];
        i = i-1;
      }
      a[i+1] = key;
      k = k + 1;
      if(n!=0)
      {
       sort(a,n,k,w);
      }
    }

  int main()
 {
    int i,n,w,k=1,z=5,g;
    printf("enter the size of an array\n");
    scanf("%d",&n);
    g=n;
    int a[n];
    for(i=1;i<=n;i++)
    {
        scanf("%d", &a[i]);
    }
    w = n;
    sort(a,n-1,k,w);

    for(i = 1; i <= n; i++)
    {
        printf("%d", a[i]);
    }
 }

Here is the solution. This might help you.

Answer 3

Here is a working version for your given example:

One very fast efficiant and logical way of doing the problem works if you know the range of the values to be sorted, for example 0 <= val <= 100 where val is integer.

Then you can do it with a single read and write operation in only two loops... one for reading the array, one for writing it sorted:

Use a second array where the indices represent values 0-100, store in it the number of times every value 0-100 is encountered, for example val = 100 could exist 234 times in your target array...

There is only one loop for reading and one loop for writing, which is computationally as efficient as one loop which would do both the reading and the writing and faster than a loop that uses comparison... If you insist, you can do it in a single loop twice as long as the target array's length and reset i value to zero on the new array write operation.

The second loop simply writes in order the count of every value encountered in the first array.

Answer 4

Sorting an array using java in Single Loop:

    public int[] getSortedArrayInOneLoop(int[] arr) {

    int temp;
    int j;

        for (int i = 1; i < arr.length; i++) {
        j = i - 1;

            if (arr[i] < arr[j]) {

            temp = arr[j];
            arr[j] = arr[i];
            arr[i] = temp;
            i = 1;

            }

        }

    return arr;

    }

Answer 5

with python:

def sort(array):
    n = len(array);
    i = 0;
    mod = 0;
    if(len(array)<= 1):
        return(array)

    while n-1:
        if array[mod] > array[mod+1]:
            array[mod], array[mod+1] = array[mod+1], array[mod]

        mod+=1
        if mod+1 >= n:
            n-=1
            mod = 0

    return array

Answer 6

def my_sort(num_list):
    x = 0
    while x < len(num_list) - 1:
        if num_list[x] > num_list[x+1]:
            num_list[x], num_list[x+1] = num_list[x+1], num_list[x]
            x = -1
        x += 1
    return num_list

print(my_sort(num_list=[14, 46, 43, 27, 57, 42, 45, 21, 70]))
#output [14, 21, 27, 42, 43, 45, 46, 57, 70]