Write a C$++$ program that allows user to enter the grades of N students $($N is determined

by the user$)$ and stores them into an array. Then the program should output the information below.

Note$-$ Your program should be structured using functions. Each functionality should be implemented in a

separate function. In the main function, it takes the user input and call each of the user$-$defined functions

to do the calculation and print out the results in the main function.

$1-3$ highest grades, and the corresponding student indices.

$2-$ Median grade.

$3-$ Most frequently occurring grades. If multiple grades have the same highest frequency, list all of

them.

$4-$ Grade distribution:

$1)$ Number of A grades $($grades equal or more than $90)$

$2)$ Number of B grades $($grades between $80($inclusive$)$ and $90)$

$3)$ Number of C grades $($grades between $65($inclusive$)$ and $80)$

$4)$ Number of D grades $($grades between $50($inclusive$)$ and $65)$

$5)$ Number of F grades $($grades less than $50)$