Sublinear extra space. Develop a merge implementation that reduces the extra space requirement to max(M, N/M), based on the following idea: Divide the array into N/M blocks of size M (for simplicity in this description, assume that N is a multiple of M). Then, (i) considering the blocks as items with their first key as the sort key, sort them using selection sort; and (ii) run through the array merging the first block with the second, then the second block with the third, and so forth.

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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2.2.12 Sublinear extra space. Develop a merge implementation that reduces the extra
space requirement to max(M, N/M), based on the following idea: Divide the array into
N/M blocks of size M (for simplicity in this description, assume that N is a multiple
of M). Then, (i) considering the blocks as items with their first key as the sort key, sort
them using selection sort; and (ii) run through the array merging the first block with
the second, then the second block with the third, and so forth.

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