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## Main Question or Discussion Point

I have array of natural numbers from 1 to n.

They are divided into m groups, where m*(m-1)=n.

I need all m-1 elements from first group, last m-2 elements from second group, last m-3 elements from third group...zero elements from last group.

For example

5*4=20:

1,2,3,4; 5,6,7,8; 9,10,11,12; 13,14,15,16; 17,18,19,20;.

I need 1,2,3,4; 6,7,8; 11,12; 16;

Thanks!

They are divided into m groups, where m*(m-1)=n.

I need all m-1 elements from first group, last m-2 elements from second group, last m-3 elements from third group...zero elements from last group.

For example

5*4=20:

1,2,3,4; 5,6,7,8; 9,10,11,12; 13,14,15,16; 17,18,19,20;.

I need 1,2,3,4; 6,7,8; 11,12; 16;

Thanks!