Squares of Sorted Arrays - C++

#include <iostream>
using namespace std;

void InsertionSort(int a[], int n)
{
  for(int i = 1; i < n; ++i)
  {
    int key = a[i];
    int j = i-1;
    
    while(j >= 0 && key < a[j])
    {
      a[j+1] = a[j];
      --j;
    }
    
    a[j+1] = key;
  }
}

int main() 
{
  int n;
  cin >> n;
  
  int a[n];
  for(int i = 0; i < n; ++i)
  {
    cin >> a[i];
    a[i] *= a[i];
  }
  
  InsertionSort(a, n);
  
  for(int i = 0; i < n; ++i)
  {
    cout << a[i] << " ";
  }
  
  return 0;
}