I know how to solve this problem,but I want to use the BigInteger of Java,could someone help me deal with it?
email : ysymyth@gmail.com

What kind of help do you need? BigIntegers' usage is very simple, I think. Just remember they are immutable, so if you need something like a += b use a = a.add(b) and not just a.add(b).

could you send me a sample of using java bignumber? I'm new to java.