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I tested the program on my computer and got right answers for all  the given 10 test cases. But when I compile it on the Codefu compiler I got Error saying me that I have illegal includes or used classes. I 'm using C++ and in this code I used the headers string, sstream and iomanip .  Can anybody tell me what I'm doing wrong?

Thank You in advance.

The <iomanip> library is forbidden for usage.

And how would we know which libraries are forbidden? Is there any document about that?

All that include input/output manipulation like iomanip, iostream ,cstdio . I think thats all