URGENTLY NEEDED C++ please explain with steps DONT COPY someones answer and paste it

Write a function which allows user to enter an array of 10 integers and then: 1. Calculate the count of unique items in an array (firstly display the number with highest count) sample input: 6,2,6,4,5,6,6,1,3,6 sample output: count of 6=5, count of 1=1, count of 2=1, count of 3=1, count of 4=1, count of 5=1 2. Remove the redundant values from the array and display the array sample output: 1,2,3,4,5,6 3. Apply the formula on each item in an array and store the new values in the same array at same indices. item=2n+2n(21+n)