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Instead of counting two sums (of odd and even digits) and returning their difference, you could use a single sum value, subtracting a digit's value if it's even and adding if it's odd. An added benefit of this approach is that you are more protected from integer overflows: if odd and even digits are interleaved, the two-sum approach will be much less likely to overflow.
Instead of counting two sums (of odd and even digits) and returning their difference, you could use a single sum value, subtracting a digit's value if it's even and adding if it's odd. An added benefit of this approach is that you are more protected from integer overflows: if odd and even digits are interleaved, the two-sum approach will be much less likely to overflow.
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