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There might be hackers who made submission on the first day, but skipped the second day. These ones are not considered to fulfill the condition of having at least one submission per day from the second day on. Another hackers might have joined the contest any day after the first day and these ones do never fulfill the condition (of a submission per day).
The condition is something you have to consider in your calculation; it does not define the rules for input table records.
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There might be hackers who made submission on the first day, but skipped the second day. These ones are not considered to fulfill the condition of having at least one submission per day from the second day on. Another hackers might have joined the contest any day after the first day and these ones do never fulfill the condition (of a submission per day). The condition is something you have to consider in your calculation; it does not define the rules for input table records.