Left rotate array

arrayLeftRotate.cpp

#include <boost/assign/list_of.hpp>
#include <vector>

using namespace std;

vector<int> array_left_rotation(vector<int> a, int n, int k) {
  vector<int> rotated;
  int index = k % n;
  for(int i=index; i<n; i++)
  {
    rotated.push_back(a[i]);
  }
  for(int i=0; i<index; i++)
  {
    rotated.push_back(a[i]);
  }
  
  return rotated;
}

int main(){
  std::vector<int> input = boost::assign::list_of(1)(2)(3)(4)(5);
  
  vector<int> output = array_left_rotation(input, input.size(), 6);
  for(int i = 0; i < input.size();i++)
    cout << output[i] << " ";
  cout << endl;
  return 0;
}