Help need in Codeforces Round #700 Problem B

Yesterday , I submitted my code more than 8 times still my code failed on pretest 2 all the time. Now they say their was an error the question. They have said to message the to rejudge the question. As i am new here to so i dont exactly know how to pass the message.Can someone please help me how to do that?
here the announcement;

The round remains rated. If your solution failed, but you expect it to pass with new constraints, ask a message in the round, we’ll rejudge it.

They rejudged all wrong solution, see the latest announcement.

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