Dynamic memory in c++

#include <iostream>

int main()
{
  int* ptr = new int(5);
  
  int* arr = new int[3];
  arr[0] = 96;
  arr[1] = 45;
  arr[2] = 72;
  
  std::cout << *ptr << "\n";// output: 5
  
  for (int i = 0; i < 3; i++)
  {
    std::cout << arr[i] << " ";
  } // output: 96 45 72
}

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