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Question

I don't want solution of this question, i just want the explanation of the question.

Write a program that reverses a 2D array of integers, implemented as nested list, in the order of 0th element of every inner list.

Answer 1

Not sure but I think it is to sort the list based on the first integer of each list inside the array.

Example:
array = [ [4, 2 ,3], [5, 6, 1], [1, 3, 4] ]

# To improve readability and make it more look like a 2d array.

array = [
[4, 2, 3],
[5, 6, 1],
[1, 3, 4]
]

This is a 2d array, and I think you need to sort and reverse it based on the first integer of each list:

In this example, we have 3 lists:
---> [4, 2, 3]
---> [5, 6, 1]
---> [1, 3, 4]

And their first elements are 4, 5, and 1.

INPUT:
[ [4, 2 ,3], [5, 6, 1], [1, 5, 4] ]

EXPECTED OUTPUT:
[ [5, 6, 1], [4, 2 ,3], [1, 5, 4] ]

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Again, this is not a sure answer. If this is wrong, please give us more details or the sample input and output. Thanks!