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  • + 0 comments

    The problem is nice, but it is miscategorized. It has nothing to do with geometry and everything to do with combinatorics. Please move this problem to /Mathematics/Combinatorics.

  • + 0 comments

    The editorial explains how to compute the number from the formula. But how do you get the formula ? I think that it is more the point of the challenge

  • + 1 comment

    Can someone please put an editorial to this problem? I have seen the successful submissions's code, but it is hard to understand. Was any math formula used in solving this problem?

    • + 0 comments

      We have added an editorial.

  • + 1 comment

    How do I get few sample inputs

    • + 0 comments

      there's already a huge sample input at test case 2 if you hit "Run Code"

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