The CodeChef January Long Challenge has started. This programming contest runs from 1500 Indian Standard Time (IST) 4 January 2018 until 1500 IST 14 January 2018. IST is 5:30 hours ahead of UTC time.
There are two divisions, depending on the rating of the user. Division 1 is for users with a higher rating; Division 2 is for newer users.
This contest has attracted attempts to cheat in past months. Should you encounter a suspicious question, please vote to close it and notify the moderators so that it can be closed for the duration of the contest, as per site policy. The questions tend to be about algorithms related to combinatorics, graph theory, or number theory.