Can someone give me any good implemented code of C++ Biginteger for programming contest?

I need C++ biginteger code to solve competitive programming problems. Can anyone provide me please?
Boost.org, perhaps?
Can it be used in ACM ICPC?
Can it be used in ACM ICPC?


You're the one in the contest so you should know ;p. Though more seriously if you are not sure which libraries are permitted in your contest I would talk to a judge to find out. Though I see no reason as to why boost would be prohibited by them.
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