Welcome to SDUT OnlineJudge!

  Please register or log in to practice programming skills or participate in a contest.
  Anonymous visitors (without logging in ) can only check Problems, Standings, and Status.
  As a registered user, you can submit your source code and see if your solution is correct.
  Please use Chrome, Firefox, IE (above IE9) or other browsers supporting Bootstrap 3.
  Should you have any questions, please contact us.