The language of this question is bit confusing .I tried too much but I can't understand. And the test case are also no so clear. If You set this type of Question Please provide explanation of anyone testcase. Thanks
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Given that over 5000 people have solved the problem, I think it is fine the way it is. However, if you have a specific question, or can point to a specific part of the statement which you do not understand, it would be much easier to help you.
Simply saying that a problem is confusing does not help anyone.
In a live contest, if the statements are not clear you can ask for clarification