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While I was solving problem, I have encountered this problem: https://www.acmicpc.net/problem/17111
(Description is written in English, so you can see it.)
How can I solve this problem? I do not have any idea of solving it, and thought that Codeforces community is helpful.
You can get which round are unrated from the codeforces API, since you have the list of contests with https://codeforces.com/api/contest.list?gym=false and you can also have the rating changes for one contest, for example for round #550 you have them here https://codeforces.com/api/contest.ratingChanges?contestId=1144, and for an unrated round like yesterday's april fool round you'll have a comment that there are no rating changes for example https://codeforces.com/api/contest.ratingChanges?contestId=1145. So I think you just have to crawl this data and submit a program which has all the unrated rounds in it (I suppose there are less unrated rounds than rated). OR you can find Mike's secret formula for determining which contests are unrated only based on their names :P