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 Dec 31 comment Least number of inspections to find a given card @rraallvv Can you give me some hints about the 'little room'? I thought about this for 2-3 months, but I can't find a solution better than m = 49. Dec 31 awarded Commentator Dec 31 comment Least number of inspections to find a given card @rraallvv Thanks, but I want a better solution than $m = 49$. Dec 31 comment Least number of inspections to find a given card @rraallvv Player A opens all the box, so the player can see the form of the cycle. Then, the player will switch two cards which minimizes the maximum length of the cycle. Dec 30 comment Least number of inspections to find a given card My algorithm and your algorithm looks the same. I think there must be a better solution, but I can't find it. Dec 30 awarded Disciplined Dec 30 asked Least number of inspections to find a given card Nov 24 awarded Editor Oct 14 awarded Student Oct 13 comment How can I use Gauss elimination to solve equations with Modular arithmetics? um.. is there more faster solution than just substracting? Oct 13 awarded Scholar Oct 13 accepted How can I use Gauss elimination to solve equations with Modular arithmetics? Oct 13 comment How can I use Gauss elimination to solve equations with Modular arithmetics? @Hurkyl I'm not sure that it's okay to solve n x m equations. Oct 13 asked How can I use Gauss elimination to solve equations with Modular arithmetics?