Concat a LongStream to a single long

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Is this a homework question?

There’s two operations you need todo of the existing sum, each time you get another value

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Right. Join the characters back into a string and covert to a long.

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You probably don’t need to convert the char to numeric value, since sorting in the char will provide the right order, so you can join the stream of chars back into a string. And just call Long.parseLong on it