Here is the link to my code - CodeChef: Practical coding for everyone
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Limits on n1,n2,n3 are [0,50000] and ID for an individual can be any positive integer. So it cannot be guaranteed to be less than 50000. If it is greater than that, your array is running out of limits and so is resulting in this error.
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Oh! my bad! yes! totally forgot about that.
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