C-集合

列出{1,2,....,n}之所有子集,包括空集合ϕ

code:(參考名題百則)


notion:
產生布林表
利用i,j找出對應值
0000 --> {}
1000 --> {1}
0100 --> {2}
1100 --> {1,2}
0010 --> {3}
1010 --> {1,3}
0110 --> {2,3}
依此類推

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