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For 1st day, you only need to check submissions for that particular day while starting from 2nd day, you need to check whether they had submissions on all previous days also or not. If not then those hacker_ids doesn't count!
15 Days of Learning SQL
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For 1st day, you only need to check submissions for that particular day while starting from 2nd day, you need to check whether they had submissions on all previous days also or not. If not then those hacker_ids doesn't count!