A hint is to use XOR for linear time..but how?

On Friday, February 22, 2013 12:58:07 AM UTC+5:30, marti wrote:
>
> How do I Find the Unique Element that Appears exactly k Times in an Array?
>  the problem is given an integer array, only one integer appears* k* times, 
> all the other integers appears *m* times in the array (*k*<*m*). Find out 
> that integer.
>

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