Write a recursive function of n a subset of all elements of the collection. May wish to make a collection of elements to lowercase, the original set is { a , b , ..., a + n- 1}. Input: input.txt, contains only integer n (1-26). Output: If you enter a valid, all subsets of the output set otherwise output WRONG . A subset of the output format for each line of a subset of the empty set with a blank line to indicate the non-empty set with a space between each element spacing, no spaces after the last element.

第二道小题 求子集个数
.....................\ziji
.....................\....\Debug
.....................\....\.....\vc60.idb
.....................\....\.....\vc60.pdb
.....................\....\.....\ziji.exe
.....................\....\.....\ziji.ilk
.....................\....\.....\ziji.obj
.....................\....\.....\ziji.pch
.....................\....\.....\ziji.pdb
.....................\....\gezhu.txt
.....................\....\ziji.cpp
.....................\....\ziji.dsp
.....................\....\ziji.dsw
.....................\....\ziji.ncb
.....................\....\ziji.opt
.....................\....\ziji.plg

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