Project Euler #213: Flea Circus

  • + 1 comment

    Can somebody clearify output format?

    It says P X Q(-1) mod (10^9 + 7), which makes very little sense as sample output is just single number, e.g. if I try 1.0000 instead - it will be wrong. Plus as number of cells is restricted to 40 x 40, final result will never be over 1600; which makes mod statement somehow reflecting precision of result.

    Please, help.