take a subset from the array, if the average is equal then output the
result.
backtracing can do this.

the time complexity seems not low, any good idea~~?

2011/8/27 sukhmeet singh <[email protected]>

> how to divide an integer array into 2 sub-arrays and make their averages
> equal?
> array is unsorted and we can also take any numbers and the numbers in the
> array need not be contiguous in the original array.
> how many total such array's are possible. Output them
>
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