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Javascript Program to Split the array and add the first part to the end | Set 2

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  • Last Updated : 24 Jan, 2022

Given an array and split it from a specified position, and move the first part of array add to the end. 
 

Examples: 
 

Input : arr[] = {12, 10, 5, 6, 52, 36}
            k = 2
Output : arr[] = {5, 6, 52, 36, 12, 10}
Explanation : Split from index 2 and first 
part {12, 10} add to the end .

Input : arr[] = {3, 1, 2}
           k = 1
Output : arr[] = {1, 2, 3}
Explanation : Split from index 1 and first
part add to the end.

 

A O(n*k) solution is discussed here
This problem can be solved in O(n) time using the reversal algorithm discussed below, 
1. Reverse array from 0 to n – 1 (where n is size of the array). 
2. Reverse array from 0 to n – k – 1. 
3. Reverse array from n – k to n – 1.
 

Javascript




<script>
// Javascript program to Split the array and
// add the first part to the end
  
/* Function to reverse arr[] from index start to end*/
function rvereseArray(arr, start, end)
{
    while (start < end)
    {
        let temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
  
// Function to print an array
function printArray(arr, size)
{
    for (let i = 0; i < size; i++)
        document.write(arr[i] + " ");
}
  
/* Function to left rotate arr[] of size n by k */
function splitArr(arr, k, n)
{
    rvereseArray(arr, 0, n - 1);
    rvereseArray(arr, 0, n - k - 1);
    rvereseArray(arr, n - k, n - 1);
}
  
/* Driver program to test above functions */
let arr = new Array( 12, 10, 5, 6, 52, 36 );
let n = arr.length;
let k = 2;
  
// Function calling
splitArr(arr, k, n);
printArray(arr, n);
  
// This code is contributed
// by _saurabh_jaiswal
</script>

Output: 
 

5 6 52 36 12 10 

 

Please refer complete article on Split the array and add the first part to the end | Set 2 for more details!

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