Debug a small code

We were asked to write the program thats described in the attached '[login to view URL]' file. And along the way we were asked to use C++ high resolution clock. And I tried using that but for some reason its not outputting the proper time values. It seems like the time values are increasing sequentially but actually it needs to vary depend on the memory requirement. The total time for execution at the end seems wrong too. And I just didn't know how to get that working since the program uses sleep function to simulate the process execution. Can someone please fix the program so that the execution time using malloc/free shows proper time values and the total execution time shows proper time as well. All the functionalities of the program should remain intact and still use the C++ high resolution clock for time calculations in nanoseconds.