Why Do These Old Rounds (229–233) Have No Problem Ratings?

Revision en1, by Leeking, 2026-10-06 21:02:21

While roaming through old Codeforces contests, I found a strange gap from early 2014.
A whole series of consecutive Div1 and Div2 rounds has zero difficulty ratings on their problems:

Does anyone who was around back then know why this specific stretch was skipped? Did these rounds run into contest-day issues, or did the rating calculation script just bypass them?

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en1 English Leeking 2026-10-06 21:02:21 999 Initial revision (published)