Is the starting accumulator a 2 element array because the result needs to be a 2 element array? ie. does the format of the accumulator have the be the format of the final output?
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Is the starting accumulator a 2 element array because the result needs to be a 2 element array? ie. does the format of the accumulator have the be the format of the final output?
This comment is hidden because it contains spoiler information about the solution