C++ Program to Split the array and add the first part to the end | Set 2
Given an array and split it from a specified position, and move the first part of array add to the end.Â
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Examples:Â
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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.
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A O(n*k) solution is discussed here.Â
This problem can be solved in O(n) time using the reversal algorithm discussed below,Â
1. Reverse array from 0 to n – 1 (where n is size of the array).Â
2. Reverse array from 0 to n – k – 1.Â
3. Reverse array from n – k to n – 1.
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C++
#include <bits/stdc++.h>
using namespace std;
void rvereseArray( int arr[], int start, int end)
{
while (start < end) {
int temp = arr[start];
arr[start] = arr[end];
arr[end] = temp;
start++;
end--;
}
}
void printArray( int arr[], int size)
{
for ( int i = 0; i < size; i++)
cout << arr[i] << " " ;
}
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);
}
int main()
{
int arr[] = { 12, 10, 5, 6, 52, 36 };
int n = sizeof (arr) / sizeof (arr[0]);
int k = 2;
splitArr(arr, k, n);
printArray(arr, n);
return 0;
}
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Output:Â
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5 6 52 36 12 10
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Please refer complete article on Split the array and add the first part to the end | Set 2 for more details!
Last Updated :
24 Jan, 2022
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