Information from the Judges

Thirteen problems are planned. The problems are given in a random order.

Interactive Problems

Interactive problems are the same as other problems in a way that your program will read from standard input and print results to standard output. The difference is, the standard input and output are connected to a special program (judge program), with which you have to communicate back and forth. Unlike other problems where the input text is fixed for each test case, the input varies based on your prior outputs.

With interactive problems, it is crucial to make sure the output is actually sent from your program. As a reference, please read Section 4, “Note on Interactive Problems”, in last year’s Judging Notes:
https://storage.googleapis.com/files.icpc.jp/regional2025/judging-notes.pdf
We will provide an interactive problem in the rehearsal session held the day before the contest.