solving old challenge problems

Is there a way for me to run old challenge problems?

Yeah, you can find them in challenge section.In general for example the problem code is let us say ‘FACTORIZ’, then you can open the problem by http://codechef.com/problems/FACTORIZ

Yeah. All challenge problems are shifted to this link after the contest: http://www.codechef.com/problems/challenge

You can practice here.

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