Produce MapReduce algorithms (in the form of a pseudo-code) to take a very large file of integers and produce as output, the same set of integers, but with each integer appearing only once

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Produce MapReduce algorithms (in the form of a pseudo-code) to take a very large file of integers and produce as output, the same set of integers, but with each integer appearing only once.

e.g., of a pseudocode design for the word count problem is as follows:

map(key, value):

// key: document name; value: text of document

for each word w in value:

emit(w, 1)

reduce(key, values):

// key: a word; value: an iterator over counts

result = 0

for each count v in values:

result += v

emit(result)