First of all I would like to thank the Owner of HUST for Creating such a Platform for Practicing Programming Through Contest Freely .I would Like to Request the the the Site Coordinator to Add " HackerRank" as another Online Judge to Scroll the Problems from it that we are able to Add the Problems in Creating Contest . The reason is that Hacker Rank Contains some Extraordinary Math Problems & Bit Manipulation Problems . And most importantly We know "ProjectUler" is a Great Site to Practice Mathematics for Competitive Programming . But they doesn't Contains any Code Submission Facility . But "HackerRank" contains the Problems of " ProjectUler " as Programming Problems and I am sure that must be a Great Initiative to Add "HackerRank" as a Judge in HUST .Thannks In Advance.