Since there were no solutions submitted for POW 2025-13, we will postpone the due date of POW 2025-13 to Oct. 3 (Fri.) 3PM.
We remark that the problem is designed so that the answer with smallest number of punches earns +4, and the next four best answers earn +3 each. (In other words, you may earn some points even if your answer is not optimal.)
I tried to submit. But I couldn’t send email to the designated email address.
Thank you for your message. It seems that the email address pow@mathsci.kaist.ac.kr has some problem. Since it is the first day of the long break, I do not expect that the problem can be resolved soon, so please submit you solution to jioon.lee@kaist.edu (my email address). See also the most recent announcement on the changed due date.