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its a finite array,arr[] of length 10
- abhushan.26 August 03, 2014so start by doing a simple algorithm
add i,x element
where x= 10-i
& i = first
add arr[i]+arr[x]=y
then calculate z=y-arr[x]
& do the above step till i=4
if z is common for any, then you got the duplicate entity
if no common value is found, the arr[5], element at index 5 is the duplicate entity :)