Description: Write a recursive function, an n-element set of all subset of. May wish to make a collection of elements to lowercase letters, the original set is {' a' , ' b' , ..., ' a' + n- 1}. Input: input.txt contains only the integer n (1-26). Output: enter a valid subset of the output collection otherwise output " WRONG" . A subset of a subset of the output format for each line, empty set with an empty line, non-empty set with a space interval between each element of an element can not have spaces.
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11.cpp
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