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If it works in Python, it's slow on big numbers and a half of test cases are really big numbers. You shoud make the first pass and sum all the digits and then do the trick. You have a limit of 100.000.000.000 there which suits long type.
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Recursive Digit Sum
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If it works in Python, it's slow on big numbers and a half of test cases are really big numbers. You shoud make the first pass and sum all the digits and then do the trick. You have a limit of 100.000.000.000 there which suits long type.