There are many simple ways to do this. I would look at Data::PowerSet to generate sets of all numbers to sum, or program it myself by using the binary digits of a counter to indicate whether an element should be included:

00000 # (no element summed)
00001 #         e
00010 #       d
00011 #       d+e
00100 #     c
...
11111 # a+b+c+d+e

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What code have you written and where do you have problems?

In reply to Re: Sum of N elements in an M element array by Corion
in thread Sum of N elements in an M element array by abhay180

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