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Yes there is no need to use 2 dimensional array for printing just

11 12 13 14 15
7 8 9 10
4 5 6
2 3
1

but what if the number of rows varies? Let say there is an input.
Let say the users in...

I think it would be better if you have a 2 dimensional array.
1st element of array is array with single element: 1
2nd element of array is array with 2 elements: 2, 3
3rd element of array is array...