Source limit error

Getting source limit error in this question .

how to reduce source limit in code ?

link : http://www.spoj.com/problems/LASTDIG/

Here is link to my solution : http://ideone.com/xKpbHN

Approach : storing last digit of first 4 power of 1 to 20 (Eg 3^1,3^2,3^3,3^4)

in an array and then answering queries.

I just want to know how to remove source limit error??

please share your solution

EDited!!!

this might be helpful!

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THanks !!!
btw i was able to reduce size by trying different approach!!

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