Skip to content
Related Articles

Related Articles

Improve Article

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

  • Difficulty Level : Easy
  • Last Updated : 16 Jun, 2021

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.
 



C++




// C++ program to Split the array and
// add the first part to the end
#include <bits/stdc++.h>
 
using namespace std;
 
/* Function to reverse arr[] from index start to end*/
void rvereseArray(int arr[], int start, int end)
{
    while (start < end) {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
 
// Function to print an array
void printArray(int arr[], int size)
{
    for (int i = 0; i < size; i++)
        cout << arr[i] << " ";
}
 
/* Function to left rotate arr[] of size n by k */
void splitArr(int arr[], int k, int n)
{
    rvereseArray(arr, 0, n - 1);
    rvereseArray(arr, 0, n - k - 1);
    rvereseArray(arr, n - k, n - 1);
}
 
/* Driver program to test above functions */
int main()
{
    int arr[] = { 12, 10, 5, 6, 52, 36 };
    int n = sizeof(arr) / sizeof(arr[0]);
    int k = 2;
 
    // Function calling
    splitArr(arr, k, n);
    printArray(arr, n);
 
    return 0;
}

Java




// Java program to Split the array and
// add the first part to the end
class Geeks
{
     
/* Function to reverse arr[] from index start to end*/
static void rvereseArray(int arr[], int start, int end)
{
    while (start < end) {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
 
// Function to print an array
static void printArray(int arr[], int size)
{
    for (int i = 0; i < size; i++)
        System.out.print(arr[i] +" ");
}
 
/* Function to left rotate arr[] of size n by k */
static void splitArr(int arr[], int k, int n)
{
    rvereseArray(arr, 0, n - 1);
    rvereseArray(arr, 0, n - k - 1);
    rvereseArray(arr, n - k, n - 1);
}
 
/* Driver program to test above functions */
public static void main(String args[])
{
    int arr[] = { 12, 10, 5, 6, 52, 36 };
    int n = arr.length;
    int k = 2;
 
    // Function calling
    splitArr(arr, k, n);
    printArray(arr, n);
 
}
 
}
 
// This code is contributed by ankita_saini.

Python3




# Python3 program to Split the array
# and add the first part to the end
 
# Function to reverse arr[]
# from index start to end*/
def rvereseArray(arr, start, end):
    while start < end :
        temp = arr[start]
        arr[start] = arr[end]
        arr[end] =temp
        start += 1
        end -= 1
 
# Function to print an array
def printArray(arr, n) :
    for i in range(n):
        print(arr[i], end = " ")
 
 
# Function to left rotate
# arr[] of size n by k */
def splitArr(arr, k, n):
    rvereseArray(arr, 0, n - 1)
    rvereseArray(arr, 0, n - k - 1)
    rvereseArray(arr, n - k, n - 1)
 
# Driver Code
arr = [12, 10, 5, 6, 52, 36]
n = len(arr)
k = 2
splitArr(arr, k, n)
printArray(arr, n)
 
# This code is contributed
# by Shrikant13

C#




// C# program to Split the array and
// add the first part to the end
using System;
class GFG
{
     
/* Function to reverse arr[] from index start to end*/
static void rvereseArray(int[] arr, int start, int end)
{
    while (start < end)
    {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
 
// Function to print an array
static void printArray(int[] arr, int size)
{
    for (int i = 0; i < size; i++)
        Console.Write(arr[i] +" ");
}
 
/* Function to left rotate arr[] of size n by k */
static void splitArr(int[] arr, int k, int n)
{
    rvereseArray(arr, 0, n - 1);
    rvereseArray(arr, 0, n - k - 1);
    rvereseArray(arr, n - k, n - 1);
}
 
// Driver code
public static void Main()
{
    int[] arr = { 12, 10, 5, 6, 52, 36 };
    int n = arr.Length;
    int k = 2;
 
    // Function calling
    splitArr(arr, k, n);
    printArray(arr, n);
}
}
 
// This code is contributed
// by Akanksha Rai(Abby_akku)

PHP




<?php
// PHP 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)
    {
        $temp = $arr[$start];
        $arr[$start] = $arr[$end];
        $arr[$end] = $temp;
        $start++;
        $end--;
    }
}
 
// Function to print an array
function printArray(&$arr, $size)
{
    for ($i = 0; $i < $size; $i++)
        echo $arr[$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 */
$arr = array( 12, 10, 5, 6, 52, 36 );
$n = sizeof($arr);
$k = 2;
 
// Function calling
splitArr($arr, $k, $n);
printArray($arr, $n);
 
// This code is contributed
// by Akanksha Rai(Abby_akku)
?>

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 

 

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.  To complete your preparation from learning a language to DS Algo and many more,  please refer Complete Interview Preparation Course.

In case you wish to attend live classes with experts, please refer DSA Live Classes for Working Professionals and Competitive Programming Live for Students.




My Personal Notes arrow_drop_up
Recommended Articles
Page :