Split Array and Add First Part to End in C++

Here we will see how to split an array, and add the first part after splitting at the end position. Suppose the array contents are {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}. We want to cut this intro two parts. The first part is from index 0 to 3 (split size 4), and second part is rest. After adding the first part at the end, the array elements will be like this {4, 5, 6, 7, 8, 9, 0, 1, 2, 3}. To solve this problem, we will follow this algorithm.

Algorithm

splitArray(arr, n, k)

begin
   for i := 0 to k, do
      x := arr[0]
      for j := 0 to n-2, do
         arr[j] := arr[j+1]
      done
      arr[n-1] := x
   done
end

Example

 Live Demo

#include<iostream>
using namespace std;
void splitArray(int arr[], int n, int k){
   for(int i = 0; i<k; i++){
      int x = arr[0]; //take the first number
      for(int j = 0; j<= n-2; j++){
         arr[j] = arr[j+1];
      }
      arr[n-1] = x;
   }
}
main() {
   int data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
   int n = sizeof(data)/sizeof(data[0]);
   int i;
   cout << "Enter split size: ";
   cin >> i;
   splitArray(data, n, i);
   for(int i = 0; i <n;i++){
      cout << data[i] << " ";
   }
}

Output

Enter split size: 4
4 5 6 7 8 9 0 1 2 3