Why am I getting negative time in submission of MAXEP?

general
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In the interactive problem ‘Max and Electrical Panel’ Dec18 contest

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https://discuss.codechef.com/questions/141708/interactive-problems-and-the-way-to-deal-with-them/141760

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Negative submission time usually implies that you are violating some constraints set by the problem. For example, in this problem, you might have exceeded the number of coins used.