were all test cases hard coded?
Yes… and run on my code. Will upload editorials soon.
No need to stop hosting contests. It was a human error. You are right that one person is not enough. You may ask 3-4 people (who will not participate in the contest) to write solutions which you can test on the judge before the contest.
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No need to regret too much. It was a human error. Even contests on Codeforces gets canceled (unrated) sometimes due to human error.
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Sorry dear. For external contests its best to get in contact with organiser to resolve queries quickly. I see its addressed. Anywhere else I can help? 
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