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On any particular day, you need to compare max num of submissions among 2 types of hackers: 1) who have at least one submission since the day they submitted for the 1st time and 2) hackers who started to submit for the 1st time on that particular day (see explaination for March 5)
In this test case, for 2016-03-03, there are hackers who has submiited on 1st, 2nd and 3rd march, but max submissions done by hacker_id 18105 who has done his 1st submission on that day only.
Hence 18105 made to the list !!
I hope u got it now!!
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On any particular day, you need to compare max num of submissions among 2 types of hackers: 1) who have at least one submission since the day they submitted for the 1st time and 2) hackers who started to submit for the 1st time on that particular day (see explaination for March 5)
In this test case, for 2016-03-03, there are hackers who has submiited on 1st, 2nd and 3rd march, but max submissions done by hacker_id 18105 who has done his 1st submission on that day only.
Hence 18105 made to the list !!
I hope u got it now!!