Write a C++ function that takes an array of integers and its size as parameters and changes all the duplicate values to -1. As the sample below shows, the first occurrence of each value is left unchanged whereas later occurrences of the same value are changed to -1.

Sample output

Array data 1 2 4 5 3 2 1 5 6 4

After processing 1 2 4 5 3 -1 -1 -1 6 -1