Weekly Contest

Rules:

• There will be four problems in the contest and each will have its own difficulty level.
• The penalty time of 5 minutes will be applied for each wrong submission.
• To ensure the fairness of the contest, UPCODE will hide some test cases during the contest. When users submit incorrect submissions, UPCODE will not show the hidden test cases to the users.
• The final rating of this contest will be updated within 5 working days after the contest.