Showing:
Handle Score
@Ibrahim Nash 6564
@mb1973 5785
@Quandray 5275
@akhayrutdinov 5111
@saiujwal13083 5074
@kirtidee18 4639
@sanjay05 3762
@mantu_singh 3712
@gfgaccount 3627
@marius_valentin_dragoi 3525
Marks of PCM
Medium Accuracy: 72.66% Submissions: 475 Points: 4

You are provided with marks of N students in Physics, Chemistry and Maths.
Perform the following 3 operations:

• Sort the students in Ascending order of their Physics marks.
• Once this is done, sort the students having same marks in Physics in the descending order of their Chemistry marks.
• Once this is also done, sort the students having same marks in Physics and Chemistry in the ascending order of their Maths marks.

Example 1:

Input:
N = 10
phy[] = {4 1 10 4 4 4 1 10 1 10}
chem[] = {5 2 9 6 3 10 2 9 14 10}
math[] = {12 3 6 5 2 10 16 32 10 4}
Output:
1 14 10
1 2 3
1 2 16
4 10 10
4 6 5
4 5 12
4 3 2
10 10 4
10 9 6
10 9 32
Explanation: Firstly, the Physics marks of
students are sorted in ascending order.
Those having same marks in Physics have
their Chemistry marks in descending order.
Those having same marks in both Physics
and Chemistry have their Math marks in
ascending order.



You don't need to read input or print anything. Your task is to complete the function customSort() which takes  phy[],  chem[],  math[]  and an integer N denoting the marks and the number of students. The function sorts the marks in the described order and the final changes should be made in the given arrays only.

Expected Time Complexity: O(NLogN).
Expected Auxiliary Space: O(N).

Constraints:
1 <= N <= 10000