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What is the most compact (space efficient) method of storing an array of distinct integers?

I have an array of distinct integers which I want to save in the most compact manner. I may have to do occasional lookups, deletions, and insertions in this array so the compression algorithm must ...
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1answer
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How hexadecimal representation is more compact and intelligible for documentation?

My textbook says, "Instead, it is far better to use a hexadecimal representation for documentation purposes. Whether or not a code represents a binary number, it can be treated as ...